Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

26°F

-3°C

Humidity 97%
Wind Speed N 0 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 20 Jan 12:52 AM PST
Extended Forecast for

9 Miles WNW Illinois Valley OR

Air Stagnation Advisory January 20, 01:42am until January 21, 04:00pm
Freezing Fog Advisory January 20, 01:42am until January 20, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 20, 01:42am until January 21, 04:00pm
    Freezing Fog Advisory January 20, 01:42am until January 20, 12:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 46 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. Calm wind.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 47. Calm wind becoming east southeast around 5 mph in the evening.

    Low: 47 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 53. Light and variable wind.

    High: 53 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. North northeast wind around 6 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

Detailed Forecast

Overnight
Partly cloudy, with a low around 46. East wind around 6 mph.
Tuesday
Mostly sunny, with a high near 56. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 47. Calm wind becoming east southeast around 5 mph in the evening.
Wednesday
Mostly cloudy, with a high near 53. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 43. North northeast wind around 6 mph.
Thursday
Sunny, with a high near 49.
Thursday Night
Mostly clear, with a low around 35.
Friday
Sunny, with a high near 45.
Friday Night
Mostly clear, with a low around 37.
Saturday
Mostly sunny, with a high near 49.
Saturday Night
A slight chance of rain. Snow level 5200 feet. Mostly cloudy, with a low around 39.
Sunday
A chance of rain. Snow level 5100 feet. Partly sunny, with a high near 48.
Sunday Night
A chance of rain. Snow level 5300 feet. Mostly cloudy, with a low around 39.
Monday
A slight chance of rain. Snow level 5400 feet. Partly sunny, with a high near 51.
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ABOUT THIS FORECAST

 
Point Forecast:
9 Miles WNW Illinois Valley OR
 42.15°N 123.85°W (Elev. 3356 ft)
1:36 am PST Jan 20, 2026
1am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database