Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

30°F

-1°C

Humidity 99%
Wind Speed SSW 1 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 21 Jan 03:52 AM PST
Extended Forecast for

17 Miles SSE Agness OR

Air Stagnation Advisory January 21, 04:09am until January 21, 04:00pm
Freezing Fog Advisory January 21, 04:09am until January 21, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 21, 04:09am until January 21, 04:00pm
    Freezing Fog Advisory January 21, 04:09am until January 21, 12:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Today

    High: 59 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 46. East wind 3 to 7 mph.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 57. North northeast wind around 8 mph.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 41. Northeast wind around 11 mph.

    Low: 41 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 51. Northeast wind around 10 mph.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly cloudy, with a high near 59. East southeast wind 5 to 7 mph becoming calm in the morning.
Tonight
Partly cloudy, with a low around 46. East wind 3 to 7 mph.
Thursday
Sunny, with a high near 57. North northeast wind around 8 mph.
Thursday Night
Mostly clear, with a low around 41. Northeast wind around 11 mph.
Friday
Sunny, with a high near 51. Northeast wind around 10 mph.
Friday Night
Clear, with a low around 35.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Partly sunny, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 51.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
A slight chance of rain. Snow level 5100 feet. Partly sunny, with a high near 53.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SSE Agness OR
 42.32°N 123.96°W (Elev. 2408 ft)
3:41 am PST Jan 21, 2026
4am PST Jan 21, 2026-6pm PST Jan 27, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database