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

29°F

-2°C

Humidity 98%
Wind Speed NNE 0 MPH
Barometer NA
Dewpoint 28°F (-2°C)
Visibility NA
Last update 21 Jan 01:52 AM PST
Extended Forecast for

14 Miles SE Agness OR

Air Stagnation Advisory January 21, 02:37am until January 21, 04:00pm
Freezing Fog Advisory January 21, 02:37am until January 21, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 21, 02:37am until January 21, 04:00pm
    Freezing Fog Advisory January 21, 02:37am until January 21, 12:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 58. East wind around 5 mph becoming calm  in the morning.

    High: 58 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 45. Light east wind.

    Low: 45 °F

    Mostly Cloudy

  • 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 40. Northeast wind around 7 mph.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 40.

    Low: 40 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 48. East southeast wind around 5 mph.
Wednesday
Mostly cloudy, with a high near 58. East wind around 5 mph becoming calm in the morning.
Wednesday Night
Mostly cloudy, 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 40. Northeast wind around 7 mph.
Friday
Sunny, with a high near 51.
Friday Night
Clear, with a low around 40.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 38.
Sunday
Partly sunny, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 40.
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)
2:06 am PST Jan 21, 2026
2am 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