National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

Lat: 42.10375°NLon: 123.68508°WElev: 1389.0ft.

NA

41°F

5°C

Humidity 99%
Wind Speed WSW 2 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 25 Dec 02:52 AM PST
Extended Forecast for

7 Miles SW Illinois Valley OR

Wind Advisory December 25, 09:00am until December 25, 01:00pm
Click here for hazard details and duration
Wind Advisory

  • Overnight

    Overnight: Showers. Snow level 5300 feet. Low around 38. East northeast wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 38 °F

    Showers

  • Christmas Day

    Christmas Day: Rain and snow showers before 3pm, then a chance of rain showers. Some thunder is also possible. Snow level 4000 feet. High near 43. South wind 11 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 43 °F

    Rain/Snow

  • Thursday Night

    Thursday Night: Rain, possibly mixed with snow showers. Snow level 3800 feet. Low around 35. South wind 10 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 35 °F

    Rain/Snow

  • Friday

    Friday: Rain, possibly mixed with snow showers before 9am, then rain. Snow level 3800 feet. High near 41. Southwest wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 41 °F

    Rain/Snow
    then Rain

  • Friday Night

    Friday Night: Rain before 1am, then a chance of rain and snow. Snow level 3000 feet. Low around 30. North northwest wind 3 to 7 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 30 °F

    Rain then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain and snow before 1pm, then a chance of rain. Snow level 2700 feet. Partly sunny, with a high near 40. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 40 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Overnight
Showers. Snow level 5300 feet. Low around 38. East northeast wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Christmas Day
Rain and snow showers before 3pm, then a chance of rain showers. Some thunder is also possible. Snow level 4000 feet. High near 43. South wind 11 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday Night
Rain, possibly mixed with snow showers. Snow level 3800 feet. Low around 35. South wind 10 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Friday
Rain, possibly mixed with snow showers before 9am, then rain. Snow level 3800 feet. High near 41. Southwest wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Friday Night
Rain before 1am, then a chance of rain and snow. Snow level 3000 feet. Low around 30. North northwest wind 3 to 7 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Saturday
A chance of rain and snow before 1pm, then a chance of rain. Snow level 2700 feet. Partly sunny, with a high near 40. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
Mostly sunny, with a high near 45.
Sunday Night
Partly cloudy, with a low around 31.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 34.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Mostly clear, with a low around 37.
Wednesday
Sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles SW Illinois Valley OR
 42.03°N 123.78°W (Elev. 2428 ft)
Last Update:
2:36 am PST Dec 25, 2025
Forecast Valid:
3am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation