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

33°F

1°C

Humidity 98%
Wind Speed S 0 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Last update 21 Jan 09:52 AM PST
Extended Forecast for

14 Miles SE Agness OR

Air Stagnation Advisory January 21, 10:37am until January 23, 04:00pm
Freezing Fog Advisory January 21, 10:37am until January 21, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 21, 10:37am until January 23, 04:00pm
    Freezing Fog Advisory January 21, 10:37am until January 21, 12:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Today

    High: 58 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 45. Light east wind.

    Low: 45 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 56. Northeast wind around 5 mph.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 41. Northeast wind around 7 mph.

    Low: 41 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 50. Northeast wind around 7 mph.

    High: 50 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 34.

    Low: 34 °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
Partly sunny, with a high near 58. Calm wind.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 45. Light east wind.
Thursday
Sunny, with a high near 56. Northeast wind around 5 mph.
Thursday Night
Mostly clear, with a low around 41. Northeast wind around 7 mph.
Friday
Sunny, with a high near 50. Northeast wind around 7 mph.
Friday Night
Clear, with a low around 34.
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
Mostly sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 53.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
14 Miles SE Agness OR
 42.42°N 123.87°W (Elev. 2461 ft)
9:46 am PST Jan 21, 2026
10am PST Jan 21, 2026-6pm PST Jan 27, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database