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 98%
Wind Speed NW 1 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Last update 24 Dec 10:52 PM PST
Extended Forecast for

14 Miles SE Agness OR

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

  • Tonight

    Tonight: Rain. Snow level 5200 feet. Low around 41. East wind 8 to 11 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain

  • Christmas Day

    Christmas Day: Rain, mainly after 8am. Snow level 4000 feet. High near 44. South wind 11 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 44 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Snow level 3800 feet. Low around 40. South southeast wind 9 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain

  • Friday

    Friday: Rain. Snow level 3700 feet. High near 41. South southeast wind 9 to 13 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 41 °F

    Rain

  • Friday Night

    Friday Night: Rain before 1am, then rain and snow likely. Snow level 3100 feet. Low around 35. West northwest wind 3 to 5 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 35 °F

    Rain then
    Rain/Snow
    Likely

  • 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 41. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 41 °F

    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

Detailed Forecast

Tonight
Rain. Snow level 5200 feet. Low around 41. East wind 8 to 11 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Christmas Day
Rain, mainly after 8am. Snow level 4000 feet. High near 44. South wind 11 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain. Snow level 3800 feet. Low around 40. South southeast wind 9 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. Snow level 3700 feet. High near 41. South southeast wind 9 to 13 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain before 1am, then rain and snow likely. Snow level 3100 feet. Low around 35. West northwest wind 3 to 5 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 41. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 34.
Monday
Sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 38.
Tuesday
Mostly sunny, with a high near 53.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
A slight chance of rain. Sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
14 Miles SE Agness OR
 42.42°N 123.87°W (Elev. 2461 ft)
Last Update:
10:31 pm PST Dec 24, 2025
Forecast Valid:
11pm PST Dec 24, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database Weather Element Forecast

Chance of Precipitation