Western Zone Weather Forecast: In-Depth Analysis & Regional Impact (December 23-24, 2025)

Western Zone Weather: A Deep Dive into December's Dynamic Conditions

As December 2025 draws to a close, the Western Zone of the United States is bracing for a diverse range of weather phenomena, from significant rainfall and potential thunderstorms across California to wintry mixes in the Pacific Northwest and largely clear, mild conditions in the desert Southwest. This comprehensive weather analysis provides an in-depth look at the hourly forecasts for key cities, offering residents and travelers critical insights into what to expect over the next 12 to 24 hours, starting from the afternoon of December 23rd and extending into the early hours of December 24th. Understanding these localized weather patterns is crucial for planning your activities, ensuring safety, and staying prepared for the dynamic atmospheric shifts characteristic of the region. We'll delve into temperature fluctuations, precipitation probabilities, wind patterns, and humidity levels to paint a complete picture of the Western Zone's immediate meteorological future. From the bustling streets of Los Angeles to the scenic landscapes of Portland and the vibrant desert of Las Vegas, each locale presents its own unique challenges and opportunities under the watchful eye of Mother Nature. Stay informed with our detailed breakdowns and regional news updates designed to keep you ahead of the weather curve.

Los Angeles, CA In-Depth Forecast

For residents of Los Angeles, the afternoon of December 23rd begins with mild temperatures and a noticeable chance of light rain, setting the stage for an increasingly wet and potentially stormy evening. From 12:00 PM to 4:00 PM PST, temperatures will hold steady at a comfortable 64°F, gradually dipping to 61°F by 2:00 PM. During this initial period, the probability of precipitation hovers around 42%, indicating sporadic light showers are possible. Winds will be a consistent presence, blowing from the southeast at 10 to 15 mph, which could make conditions feel slightly cooler than the actual air temperature. Humidity levels are quite high, ranging from 84% to 87%, contributing to the damp feel in the air.

As the late afternoon transitions into evening, specifically from 4:00 PM to 9:00 PM PST, the weather takes a more significant turn. The chance of rain escalates to 54%, with the forecast shifting to "Chance Rain Showers." Temperatures will remain mild, around 61°F, before dropping slightly to 59°F by 8:00 PM. The southeasterly winds will persist at 15 mph, making conditions breezy. The relative humidity will climb further, reaching into the low to mid-90s, signaling a saturated atmosphere conducive to more continuous rainfall. This period suggests that outdoor evening plans might be impacted by more persistent showers.

The most dramatic shift in the forecast for Los Angeles occurs overnight, from 10:00 PM PST on December 23rd into the first hour of December 24th. The probability of precipitation skyrockets to an alarming 96%, with the short forecast indicating "Showers And Thunderstorms." This means not only heavy rain but also the potential for lightning and thunder, a less common but significant event for the region. Temperatures will dip further to 56°F by 10:00 PM, then rebound slightly to 59°F by midnight, though the feeling will be cold and wet. Winds will maintain their 15 mph speed from the southeast, potentially gusting higher during thunderstorms. Residents should prepare for significant rainfall, reduced visibility, and possible localized flooding, especially in low-lying areas or near recent burn scars. Travel during these late-night hours could be hazardous. It is advisable to secure loose outdoor items and avoid unnecessary travel.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Los Angeles, CA.

San Diego, CA In-Depth Forecast

San Diego, California, is also expecting a wet turn as the day progresses on December 23rd, though with a slightly less intense outlook compared to its northern neighbor, Los Angeles. The early afternoon, from 12:00 PM to 4:00 PM PST, will see mild temperatures ranging from 64°F to 65°F. There's a 31% chance of rain showers during this time, suggesting that while rain is possible, it won't be constant. Southerly winds will blow gently at 10 mph, and relative humidity will be in the comfortable range of 74% to 78%. This period still allows for some outdoor activities, but an umbrella or light rain jacket would be prudent.

By late afternoon and into the evening, from 4:00 PM to 10:00 PM PST, the likelihood of rain increases significantly for San Diego. The probability of precipitation jumps to 64%, with the forecast calling for "Rain Showers Likely." Temperatures will remain mild, around 61°F to 64°F, ensuring that the rain will be purely liquid. Winds will continue from the south to southeast at a steady 10 mph. Humidity levels will rise, reaching 82% to 89%, creating a damp and muggy atmosphere. This period suggests that any evening plans should account for a high chance of rain, making indoor activities more appealing. Drivers should be prepared for wet roads and reduced visibility.

As December 23rd transitions into the very late hours, from 10:00 PM PST to midnight, there's a slight easing in the intensity of the precipitation. The probability of precipitation drops to 46%, with the forecast indicating a "Chance Light Rain." Temperatures will hover around 61°F to 62°F. Southeasterly winds will remain at 10 mph. While the heavy showers might subside, residents should still expect intermittent light rain. The high humidity, in the upper 80s, will keep the air feeling saturated. Even with the decreased chance, it's wise to remain cautious, as roads will still be slick and conditions could change rapidly. Overall, San Diego will experience a prolonged period of rain and showers, peaking in the evening before a slight lull around midnight.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for San Diego, CA.

San Jose, CA In-Depth Forecast

San Jose, nestled in the heart of Silicon Valley, is poised for a significant increase in rainfall and strengthening winds as December 23rd progresses into the evening and overnight hours. The early afternoon, from 12:00 PM to 4:00 PM PST, presents a relatively mild picture with temperatures around 61°F to 62°F. During this time, there's only a slight chance of light rain, with precipitation probabilities ranging from 17% to 18%. Southerly to south-southeasterly winds will gradually pick up, starting at 14 mph and increasing to 18 mph. Relative humidity will be around 77%, suggesting a damp but not yet saturated atmosphere. This period offers a brief window of drier conditions before the main weather system arrives.

The late afternoon and early evening, from 4:00 PM to 7:00 PM PST, will see a noticeable shift as the rain chances rise. The probability of precipitation jumps to 56%, indicating "Light Rain Likely." Temperatures will hold steady at 61°F to 62°F. The winds will become more formidable, reaching 18 to 20 mph from the south-southeast. Humidity will also increase to 78% to 79%. This period marks the beginning of more consistent rainfall, making outdoor activities increasingly difficult and signaling the need for caution, especially for commuters. Road surfaces will become wet and potentially hazardous.

The most impactful weather for San Jose is expected from 7:00 PM PST on December 23rd through midnight. During these hours, the probability of precipitation escalates dramatically, starting at 55% "Light Rain Likely" and rapidly climbing to 66%, then 68%, 70%, 82%, and finally 86% by midnight, with the short forecast simply stating "Rain." This indicates a transition to steady and potentially heavy rainfall. Temperatures will gradually cool from 60°F to 58°F. The winds will be a major factor, strengthening further to 20-23 mph from the southeast, bringing with them the potential for strong gusts that could affect high-profile vehicles and cause minor tree damage. Relative humidity will soar into the 80s and 90s, indicating a very saturated air mass. Residents should prepare for a very wet and windy night, with potential for localized flooding and difficult driving conditions. Securing outdoor furniture and decorations is highly recommended.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for San Jose, CA.

San Francisco, CA In-Depth Forecast

San Francisco's weather on December 23rd starts with a characteristic coastal condition: areas of fog, which will gradually lift to reveal a day dominated by a consistent chance of light rain and increasing winds. From 5:00 AM to 11:00 AM PST, the city will experience temperatures around 55°F to 57°F, with the early hours marked by fog. The probability of precipitation during this morning period ranges from 38% to 41%, indicating a chance of light rain even amidst the fog. Winds will be light, starting at 5 mph from the south-southeast and gradually increasing to 13-15 mph by late morning. Relative humidity will be extremely high, in the upper 90s, characteristic of foggy, damp conditions.

As the day progresses into the afternoon, from 11:00 AM to 5:00 PM PST, San Francisco will continue to see mild temperatures, rising slightly to 59°F-60°F. The chance of light rain will persist throughout this period, with precipitation probabilities holding steady around 36% to 40% before increasing to 55% by 4:00 PM, changing the forecast to "Light Rain Likely." Winds will become more pronounced, blowing consistently from the south-southeast at 15 to 20 mph. These moderate winds, combined with the continuous chance of rain, will make for a blustery and damp afternoon. The high humidity, still in the upper 80s and low 90s, will ensure the air remains heavy with moisture. Outdoor activities will require full rain gear, and commuters should anticipate wet roads and potentially reduced visibility, especially with the gustier winds.

The persistent nature of the light rain throughout the day means that ground saturation will increase steadily, potentially leading to standing water in some areas by late afternoon. The winds, while not reaching extreme levels, will be strong enough to make crossing bridges or exposed areas uncomfortable. Residents should plan for a thoroughly damp day, ensuring that appropriate outerwear is chosen for any ventures outside. The forecast implies that while heavy downpours are not the primary concern, a steady, soaking rain is expected, which can accumulate over time. This continuous moisture is beneficial for the region's water supply but necessitates careful planning for daily routines. Overall, San Francisco will be under a gray, rainy sky for the majority of the day, with conditions becoming more definitively wet by late afternoon.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for San Francisco, CA.

Sacramento, CA In-Depth Forecast

Sacramento is set for a significant transition on December 23rd, starting with relatively clear conditions before a substantial increase in rain and wind takes hold through the evening and overnight. From 12:00 PM to 5:00 PM PST, the city will experience mild temperatures, hovering around 59°F to 60°F. The early afternoon begins with "Mostly Sunny" skies and a low 10% chance of precipitation. However, by 1:00 PM, a "Slight Chance Light Rain" emerges, with probabilities ranging from 18% to 27%, then dropping to 21% by 4:00 PM. Southeasterly winds will gradually strengthen from 9 mph to 14 mph. Humidity will be high, in the upper 80s and low 90s, even with the sparse precipitation, indicating a moist air mass already in place.

As the late afternoon gives way to evening, from 5:00 PM to 8:00 PM PST, the probability of rain begins its steady ascent. Temperatures will remain mild at 59°F. The chance of light rain will increase from 28% to 29%, still classified as "Chance Light Rain." Winds from the south-southeast will continue to strengthen, reaching 16 to 17 mph. Relative humidity will stay in the mid-80s. This period suggests that while rain is becoming more likely, it may still be intermittent, offering some reprieve. However, it's a clear signal that the weather is deteriorating, and residents should prepare for wetter conditions.

The most impactful weather for Sacramento is forecast from 8:00 PM PST on December 23rd through midnight. During these hours, the probability of precipitation surges dramatically. Starting at 55% "Light Rain Likely," it quickly rises to 62%, then 82% for "Light Rain," and finally 64% to 72% for "Rain Likely." This indicates a shift to widespread and potentially heavy rainfall. Temperatures will hold steady at 59°F. Crucially, the winds will intensify significantly, blowing from the south-southeast at 17 to 23 mph. These strong winds, combined with the heavy rain, could lead to challenging driving conditions, reduced visibility, and potential for gust-related impacts like falling branches or power outages. Relative humidity will remain very high, in the upper 70s and 80s. Residents are strongly advised to complete any outdoor errands early and stay indoors during the peak of the storm. Travel will be difficult, and safety should be the top priority.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Sacramento, CA.

Fresno, CA In-Depth Forecast

Fresno, located in California's Central Valley, is poised for a dramatic shift in weather, with a mostly dry and mild day giving way to a high probability of heavy rain late on December 23rd and into the early hours of December 24th. The afternoon, from 12:00 PM to 5:00 PM PST, will be relatively calm, with temperatures ranging from 62°F to 63°F. Skies will be mostly cloudy to cloudy, but the chance of precipitation is very low, only 8%. Winds will be light, blowing from the southeast at a gentle 5 mph. Relative humidity will be in the lower 70s, indicating a relatively dry air mass for most of the day. This period offers a pleasant, albeit overcast, window for outdoor activities.

As the late afternoon transitions into early evening, from 5:00 PM to 9:00 PM PST, there's a slight increase in the chance of rain, but conditions remain largely manageable. Temperatures will cool slightly to 61°F to 62°F. The probability of precipitation rises to 16%, bringing a "Slight Chance Light Rain." Southeasterly winds will remain light, at 5 to 10 mph. Humidity levels will hover around 67% to 70%. While an umbrella might be useful, this period is not expected to bring widespread disruption. It's a precursor to the more significant weather event that will follow, so residents should remain aware of the changing forecast.

The most impactful weather for Fresno is expected to hit hard from 10:00 PM PST on December 23rd through midnight. During these critical hours, the probability of precipitation surges to an overwhelming 94%, with the short forecast simply stating "Rain." This indicates a high likelihood of widespread and potentially heavy rainfall. Temperatures will remain mild for the time of year, around 62°F. Winds will continue from the southeast at a light 10 mph, meaning the rain itself, rather than strong winds, will be the primary concern. Relative humidity will climb dramatically, reaching 62% to 65% despite the mild temperatures, as the air becomes saturated. Residents should prepare for significant rainfall that could lead to localized flooding, especially in urban areas and low-lying agricultural fields. Driving conditions will become hazardous due to reduced visibility and slick roads. It is strongly advised to avoid unnecessary travel during these late-night hours and ensure drainage systems are clear. This late-night deluge could have substantial impacts across the valley.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Fresno, CA.

Portland, OR In-Depth Forecast

Portland, Oregon, is facing a cold and increasingly wintry outlook for December 23rd, with temperatures hovering near freezing and a rising chance of mixed precipitation. The afternoon, from 12:00 PM to 5:00 PM PST, will be characterized by cold temperatures ranging from 33°F to 34°F. Skies will be mostly cloudy to cloudy, with a slight chance of light snow (12% to 16%) emerging by 3:00 PM. Southeasterly winds will be light, at 5 to 6 mph. Relative humidity will be high, in the mid-80s, indicating a damp and chilly atmosphere. While significant snow is not expected initially, the cold temperatures mean any precipitation could be wintry.

As the late afternoon transitions into evening, from 5:00 PM to 8:00 PM PST, the cold conditions persist, with temperatures remaining at 34°F. The probability of precipitation begins to increase, with a "Slight Chance Light Snow" (17% to 20%) continuing through this period. Winds will pick up slightly to 6 to 8 mph from the southeast. Relative humidity will remain high, in the mid-80s. This period indicates a continued risk of light snow or a rain-snow mix, especially on elevated surfaces or in colder microclimates. Commuters should be aware of potentially slick spots on roads, particularly bridges and overpasses.

The most significant change for Portland is expected from 8:00 PM PST on December 23rd through midnight. During these hours, the probability of precipitation increases notably, with the forecast shifting to "Chance Rain And Snow" (30% to 48%) and then to "Rain And Snow Likely" (47% to 55%) by midnight. Temperatures will slowly climb to 35°F by 10:00 PM and 36°F by midnight, bringing them just above freezing, which increases the likelihood of a rain-snow mix rather than pure snow. Winds will strengthen to 9 to 14 mph from the east-southeast. Relative humidity will remain high, in the low 80s. Residents should prepare for a night of mixed precipitation, which could lead to slushy conditions, reduced visibility, and potentially hazardous travel. The transition between rain and snow can be tricky, and drivers should exercise extreme caution. It is advisable to monitor local road conditions closely, especially for any travel in or out of the city, as conditions may vary.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Portland, OR.

Boise, ID In-Depth Forecast

Boise, Idaho, presents a distinct weather pattern on December 23rd, starting with a high likelihood of rain in the early afternoon, followed by significant clearing and colder, mostly cloudy conditions through the evening. From 12:00 PM to 4:00 PM MST, Boise will experience cold temperatures, hovering between 37°F and 38°F. The period begins with a 59% probability of precipitation, indicating "Light Rain Likely." Winds will be light, around 6 mph, and variable in direction (E, S, N, NW). Relative humidity will be very high, in the mid-90s, characteristic of a rainy atmosphere. Residents should expect damp conditions and dress accordingly if out and about in the early afternoon.

A significant change occurs in the late afternoon and through the evening, from 4:00 PM to midnight MST. After 4:00 PM, the probability of precipitation drops dramatically to a low 12%, with the forecast shifting to "Mostly Cloudy" and "Cloudy." Temperatures will remain cold, around 38°F to 39°F, before rising slightly to 40°F by midnight. Winds will pick up slightly to 8 to 10 mph, becoming more consistently from the west or northwest. Relative humidity will decrease from the mid-80s to the mid-70s, reflecting the drier conditions as the rain moves out. This period offers a much-needed break from the rain, providing clearer (though still overcast) skies for evening activities.

While the threat of rain largely diminishes after the early afternoon, the persistent cold temperatures mean that any standing water could refreeze overnight if temperatures drop further than forecast, creating icy patches. Residents should be mindful of potentially slick surfaces, especially on sidewalks and untreated roads, as they head out in the morning of December 24th. The clearing trend is a positive development for those planning evening travel or wanting to avoid persistent wet weather. However, the presence of cloud cover throughout the night will help to prevent a sharp temperature drop, keeping conditions from becoming excessively cold. Overall, Boise will see a wet start to its afternoon, followed by a much drier and merely cloudy evening, but with continued chilly temperatures.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Boise, ID.

Las Vegas, NV In-Depth Forecast

Las Vegas, Nevada, is set for a mild and mostly cloudy day on December 23rd, with very low chances of precipitation, offering a pleasant and uneventful weather experience. The afternoon, from 12:00 PM to 5:00 PM PST, will see warm temperatures, starting at 66°F and peaking at 67°F before cooling to 65°F. Skies will be consistently "Cloudy" throughout this period. The probability of precipitation is extremely low, ranging from 6% to 14%, meaning any rain is highly unlikely. Southerly to southeasterly winds will be light, at a gentle 6 mph. Relative humidity will be low, in the mid-30s, characteristic of the desert climate. This period is ideal for enjoying outdoor activities without concerns about rain.

As the late afternoon transitions into evening, from 5:00 PM to midnight PST, Las Vegas will experience a gradual cooling, with temperatures dropping from 64°F to 57°F. The skies will transition from "Mostly Cloudy" to "Partly Cloudy," offering more breaks in the cloud cover as the night progresses. The probability of precipitation remains very low, ranging from 3% to 11%, reinforcing the dry forecast. Winds will continue to be light, increasing slightly to 7 to 10 mph from the southeast. Relative humidity will gradually climb from the low 40s to the high 60s, a natural increase as temperatures fall overnight in desert environments, but still remaining comfortable. The overall conditions suggest a very pleasant evening for residents and visitors.

With no significant weather threats on the horizon, Las Vegas residents and tourists can confidently plan evening outings, dining experiences, or leisurely strolls along the Strip. The mild temperatures and lack of precipitation create an inviting atmosphere. However, as is always prudent in desert regions, it's wise to carry a light jacket for the evening cool-down, especially after sunset. The consistent, light winds will contribute to a comfortable feel, and the relatively low humidity ensures the air will not feel oppressive. This period is a stark contrast to the wet conditions impacting California and the wintry weather in the Pacific Northwest, highlighting the diverse climate of the Western Zone. Overall, Las Vegas will enjoy a calm, mild, and dry December evening, perfect for holiday festivities.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Las Vegas, NV.

Salt Lake City, UT In-Depth Forecast

Salt Lake City, Utah, is expected to experience a mild and cloudy day on December 23rd, with a very low chance of precipitation, making for a relatively stable weather pattern. The afternoon, from 1:00 PM to 5:00 PM MST, will see mild temperatures for the season, starting at 49°F and peaking at 50°F before cooling to 46°F. Skies will be mostly cloudy to cloudy throughout this period, indicating persistent overcast conditions. The probability of precipitation is extremely low, ranging from 0% to 7%, meaning rain or snow is highly unlikely. Southerly winds will be moderate, blowing at 12 to 14 mph. Relative humidity will be low, in the low 30s, reflecting dry air despite the cloud cover. This period is suitable for most outdoor activities, though a jacket would be necessary given the cooler temperatures and wind chill.

As the late afternoon transitions into evening and overnight, from 5:00 PM MST on December 23rd through 1:00 AM MST on December 24th, Salt Lake City will see a gradual cooling, with temperatures dropping from 46°F to 39°F. The cloud cover will largely persist, maintaining "Cloudy" to "Mostly Cloudy" skies. The probability of precipitation remains very low, staying within the 7% to 8% range, so no significant wet weather is anticipated. Southerly winds will continue at a moderate 13 to 14 mph, which will contribute to the chill in the air. Relative humidity will slowly climb from the mid-30s to the mid-50s as temperatures fall, a typical overnight pattern. Despite the cloudiness, the dry conditions mean no immediate concerns for icy roads or significant snowfall, which is a welcome relief for winter travel.

Residents should plan for a continued mild, overcast, and dry evening. The moderate southerly winds might make it feel a bit colder than the stated temperature, especially in exposed areas, so layering clothing is recommended. For those venturing out, visibility should remain good, as no fog or heavy precipitation is expected. The consistent cloud cover will act as a blanket, preventing temperatures from plummeting dramatically overnight, offering some protection from harsh winter cold. This forecast suggests that Salt Lake City will largely escape the more dynamic weather systems affecting other parts of the Western Zone, providing a calm backdrop for the end of the day. Overall, a mild, cloudy, and dry evening is in store for the Wasatch Front, with moderate breezes.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Salt Lake City, UT.

Albuquerque, NM In-Depth Forecast

Albuquerque, New Mexico, is set to enjoy a beautiful, mild, and dry day on December 23rd, followed by a clear and cold night, with absolutely no precipitation expected throughout the period. The afternoon, from 1:00 PM to 5:00 PM MST, will feature very pleasant temperatures, starting at 58°F and peaking at 59°F before cooling to 48°F. Skies will be mostly sunny to partly sunny, offering abundant sunshine. The probability of precipitation is a flat 0%, guaranteeing dry conditions. Winds will be very light, ranging from 0 to 5 mph from the southwest, making for calm air. Relative humidity will be extremely low, in the low to mid-teens, indicative of the arid desert air. This period is perfect for any outdoor activities, with comfortable temperatures and clear skies.

As the late afternoon transitions into evening and overnight, from 5:00 PM MST on December 23rd through 1:00 AM MST on December 24th, Albuquerque will experience a significant cool-down, but the dry and clear conditions will largely persist. Temperatures will drop steadily from 48°F to 36°F, signaling a cold desert night. Skies will remain mostly cloudy, with some breaks, but precipitation probability stays at 0%. Winds will continue to be very light, around 0 to 5 mph from the south. Relative humidity will gradually increase from the mid-20s to the mid-30s as the air cools, but it will still feel very dry. Residents should prepare for a chilly night, requiring warm layers, especially after sunset. The clear skies will also lead to efficient radiative cooling, contributing to the sharp temperature drop.

The lack of precipitation and very light winds mean that visibility will be excellent, and there will be no concerns for hazardous driving conditions due to weather. This weather pattern is typical for Albuquerque during the winter, offering crisp, clear days and cold nights. While the temperatures are mild for a December afternoon, the significant drop after dark emphasizes the importance of dressing in layers. For those interested in stargazing, the clear night skies will provide excellent viewing opportunities. Overall, Albuquerque will enjoy a serene and dry end to the day, with a noticeable temperature contrast between the mild afternoon and the cold overnight hours, but with consistent calm and clear weather.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Albuquerque, NM.

El Paso, TX In-Depth Forecast

El Paso, Texas, is poised for a remarkably warm and sunny day on December 23rd, with temperatures well above average for the season, followed by a mild and clear night, and absolutely no precipitation expected. The afternoon, from 1:00 PM to 5:00 PM MST, will be exceptionally pleasant, with temperatures soaring from 68°F to a peak of 70°F before settling at 65°F. Skies will be mostly sunny to sunny, ensuring abundant warmth and clear conditions. The probability of precipitation is a flat 0%, guaranteeing completely dry weather. Winds will be light, around 5 to 7 mph from the east to east-southeast, providing a gentle breeze. Relative humidity will be very low, in the mid-teens, highlighting the arid desert environment. This period is ideal for enjoying the outdoors, perhaps even feeling like an extended autumn day.

As the late afternoon transitions into evening and overnight, from 5:00 PM MST on December 23rd through 1:00 AM MST on December 24th, El Paso will experience a gradual cool-down, but conditions will remain mild for December. Temperatures will drop from 62°F to 54°F. Skies will transition from partly cloudy to mostly cloudy, with some cloud cover developing, but still no threat of rain. The probability of precipitation remains at 0%. Winds will continue to be very light, around 2 to 5 mph, and shift from easterly to northerly directions. Relative humidity will gradually increase from the low 20s to the high 20s, staying very dry. Residents will find the evening temperatures quite comfortable, requiring only a light jacket or sweater. The minimal winds will ensure a calm atmosphere, perfect for any evening plans.

The unusually warm temperatures for late December in El Paso are a notable feature of this forecast, offering a stark contrast to the wintry conditions in other parts of the Western Zone. This extended period of clear skies and mild weather provides an excellent opportunity for outdoor leisure or holiday preparations without weather interference. Drivers will face no adverse weather conditions, with clear roads and good visibility. The dry air means no concerns for fog or dew, making the morning commute on December 24th equally straightforward. Overall, El Paso will experience a consistently warm, sunny day followed by a comfortably mild and mostly clear night, making for a very pleasant end to the day and start of the next.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for El Paso, TX.

Helena, MT In-Depth Forecast

Helena, Montana, is experiencing cold, mostly cloudy conditions on December 23rd, with a slight chance of light rain in the afternoon that quickly diminishes, leading to a clear and very cold night. The afternoon, from 1:00 PM to 5:00 PM MST, will see cold temperatures ranging from 37°F to 40°F. Skies will be mostly cloudy, with a slight chance of light rain (11% to 18%) in the early afternoon, diminishing to just 8% by 4:00 PM. Southerly winds will be moderate, at 7 to 8 mph. Relative humidity will be high, in the low 70s, making the air feel damp despite the low precipitation chances. Residents should dress warmly and be prepared for a few sprinkles, though widespread rain is not expected.

As the late afternoon transitions into evening and overnight, from 5:00 PM MST on December 23rd through 1:00 AM MST on December 24th, Helena will experience a significant drop in temperatures and a clearing of precipitation chances. Temperatures will fall steadily from 37°F to 33°F. The probability of precipitation dwindles to a negligible 0% to 3%, indicating completely dry conditions. Skies will become partly cloudy, offering glimpses of the night sky. Southerly to south-southwesterly winds will remain moderate, at 6 to 7 mph. Relative humidity will stay in the mid-60s to low 70s. This period suggests a very cold night, with the clearing skies allowing for colder temperatures to settle in.

The diminishing chance of precipitation and clearing skies mean that any lingering moisture on surfaces could freeze as temperatures fall, creating black ice, especially on untreated roads and sidewalks. Residents should exercise extreme caution when traveling overnight or in the early morning of December 24th. The moderate southerly winds will contribute to a wind chill, making the already cold temperatures feel even more biting. For those planning any evening activities, very warm clothing, including hats and gloves, will be essential. The forecast for Helena highlights a typical cold Montana winter day, with a brief flirtation with light rain before a return to dry, clear, and frigid conditions. Monitoring local advisories for ice will be important for safety. Overall, a cold and mostly cloudy day transitions to a very cold, partly cloudy, and dry night in Helena.

For the most detailed, up-to-the-minute forecast, visit the official National Weather Service source: NWS Forecast for Helena, MT.

Regional Weather News Desk

Flash Flood Watch Issued for Santa Barbara County, CA

SANTA BARBARA, CA – Following an intensifying atmospheric river event impacting Southern California, the National Weather Service has issued a Flash Flood Watch for Santa Barbara County, effective from late Tuesday afternoon through Wednesday morning. Forecasters warn that persistent heavy rainfall, fueled by a 'Pineapple Express' weather pattern, could lead to rapid rises in creeks and streams, as well as potential debris flows in areas recently affected by wildfires. Residents in the vicinity of the Thomas, Cave, and Alisal burn scars are particularly urged to remain vigilant and be prepared to evacuate if conditions worsen. Emergency services are on high alert, advising against unnecessary travel during the peak of the storm. Road closures are anticipated, and motorists should check Caltrans for the latest updates before attempting to travel through the county. This watch comes as Los Angeles and San Diego also face increased rain, highlighting a widespread and significant rain event across coastal Southern California.

Winter Storm Warning for Willamette Pass, OR

BEND, OR – Travel through Oregon’s Cascade Mountains is expected to become extremely hazardous as a Winter Storm Warning has been issued for Willamette Pass and surrounding areas, including parts of Highway 58. The National Weather Service predicts heavy snowfall, with accumulations of 12 to 18 inches possible above 3,000 feet, starting Tuesday evening and continuing through Wednesday morning. Combined with winds gusting up to 30 mph, whiteout conditions and significant snow drifts are anticipated. Travelers are strongly advised to avoid non-essential trips over the pass. Chains or traction tires will be required for any vehicles attempting to traverse the area. This warning directly follows colder temperatures and a rain-snow mix impacting Portland, indicating a more severe wintry blast for higher elevations. Delays and potential closures of mountain passes are highly likely, impacting freight and holiday travelers alike. Prepare for extreme winter driving conditions.

Unusual Warmth Advisory for Phoenix, AZ

PHOENIX, AZ – While much of the Western Zone braces for rain or wintry weather, residents of Phoenix, Arizona, are experiencing an unusual stretch of warmth for late December. The National Weather Service has issued an Unusual Warmth Advisory, as temperatures are expected to reach into the low 80s on Tuesday, potentially breaking daily records. This warm spell is attributed to a persistent high-pressure system over the Southwest, diverting cooler air and storm systems to the north. While most people are enjoying the pleasant weather, the advisory reminds residents to stay hydrated, even in winter, and to protect pets from excessive heat during the sunniest parts of the day. This contrasts sharply with the chilly conditions in Boise and Salt Lake City, and the widespread rain in California, showcasing the diverse climatic zones of the American West.

Conclusion

The Western Zone is truly living up to its reputation for diverse and dynamic weather patterns as we approach the midpoint of December 2025. From the intensifying rainfall and thunderstorm threats across much of California, particularly in population centers like Los Angeles, San Jose, San Francisco, Sacramento, and Fresno, to the cold rain-and-snow mix impacting Portland, residents face a varied set of atmospheric challenges. Meanwhile, the desert regions of Las Vegas, Salt Lake City, Albuquerque, and El Paso are largely enjoying mild to warm, dry, and mostly clear conditions, with only Helena, Montana, experiencing a brief chance of light rain before a very cold night.

The overarching theme for California is one of increasing wetness, with rain probabilities escalating significantly through the evening and overnight. This underscores the importance of exercising extreme caution on roads, being aware of potential localized flooding, and securing outdoor items. For our Pacific Northwest communities like Portland, the threat of mixed precipitation means vigilance against slick roads and varying travel conditions. Contrastingly, the Southwest offers a respite from winter's bite, providing ideal conditions for outdoor activities, albeit with brisk overnight cooling.

As always, preparedness is key. We urge all residents across the Western Zone to stay informed by monitoring local weather advisories, especially if planning travel. Check road conditions before departing, ensure emergency kits are stocked, and be mindful of the unique impacts weather can have in your specific microclimate. Whether you're navigating rain-slicked highways, slushy mountain passes, or simply enjoying a clear desert evening, understanding your local forecast empowers you to make safe and informed decisions. The coming hours promise a continuation of these compelling weather stories, and staying connected to reliable weather sources will be your best defense against unexpected changes. Stay safe, stay warm (or cool!), and stay weather-aware as this dynamic December continues to unfold.