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

57°F

14°C

Humidity 52%
Wind Speed SE 1 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Last update 21 Jan 02:52 PM PST
Extended Forecast for

17 Miles SSE Agness OR

Air Stagnation Advisory January 21, 03:28pm until January 23, 04:00pm
Freezing Fog Advisory January 21, 07:00pm until January 22, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 21, 03:28pm until January 23, 04:00pm

    NOW until 4:00pm Fri

    Air Stagnation Advisory

  • Tonight

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 57. East wind around 6 mph becoming calm.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42. Northeast wind 6 to 10 mph.

    Low: 42 °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 40. East northeast wind around 15 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. North northeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 57. East wind around 6 mph becoming calm.
Thursday Night
Mostly clear, with a low around 42. Northeast wind 6 to 10 mph.
Friday
Sunny, with a high near 51. Northeast wind around 10 mph.
Friday Night
Clear, with a low around 40. East northeast wind around 15 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 53.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Partly sunny, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
A slight chance of showers. Snow level 5100 feet. Mostly sunny, with a high near 54.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 43.
Wednesday
A chance of showers. Mostly cloudy, with a high near 51.
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ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SSE Agness OR
 42.32°N 123.96°W (Elev. 2408 ft)
2:21 pm PST Jan 21, 2026
3pm PST Jan 21, 2026-6pm PST Jan 28, 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