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

Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

37°F

3°C

Humidity 99%
Wind Speed NNW 1 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 27 Dec 03:52 AM PST
Extended Forecast for

16 Miles SE Agness OR

  • Overnight

    Overnight: A chance of rain and snow showers. Snow level 2400 feet. Mostly cloudy, with a low around 35. Light and variable wind. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 35 °F

    Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain and snow showers before 9am, then a chance of rain showers after 11am. Snow level 2300 feet rising to 2800 feet in the afternoon. Partly sunny, with a high near 43. Light and variable wind becoming east southeast around 5 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 43 °F

    Chance
    Rain/Snow
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32. East wind 5 to 7 mph.

    Low: 32 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47. East northeast wind around 8 mph.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36. East wind around 7 mph.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of rain and snow showers. Snow level 2400 feet. Mostly cloudy, with a low around 35. Light and variable wind. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday
A chance of rain and snow showers before 9am, then a chance of rain showers after 11am. Snow level 2300 feet rising to 2800 feet in the afternoon. Partly sunny, with a high near 43. Light and variable wind becoming east southeast around 5 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday Night
Mostly cloudy, with a low around 32. East wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 47. East northeast wind around 8 mph.
Sunday Night
Partly cloudy, with a low around 36. East wind around 7 mph.
Monday
Sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
Sunny, with a high near 55.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Sunny, with a high near 57.
Wednesday Night
Partly cloudy, with a low around 41.
New Year's Day
A chance of rain. Partly sunny, with a high near 52.
Thursday Night
Rain likely. Snow level 4500 feet. Mostly cloudy, with a low around 41.
Friday
Rain. Snow level 3600 feet. Mostly cloudy, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
16 Miles SE Agness OR
 42.38°N 123.82°W (Elev. 1316 ft)
Last Update:
3:41 am PST Dec 27, 2025
Forecast Valid:
4am PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation