Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

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

NA

38°F

3°C

Humidity 84%
Wind Speed NNE 5 MPH
Barometer NA
Dewpoint 34°F (1°C)
Visibility NA
Wind Chill34°F (1°C)
Last update 27 Dec 08:52 PM PST
Extended Forecast for

17 Miles SSE Agness OR

  • Tonight

    Tonight: Mostly cloudy, with a low around 33. East northeast wind around 11 mph.

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 46. East northeast wind around 11 mph.

    High: 46 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37. East wind around 13 mph.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 51. East northeast wind 8 to 10 mph.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. East wind around 11 mph.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain, mainly after 4am.  Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 33. East northeast wind around 11 mph.
Sunday
Sunny, with a high near 46. East northeast wind around 11 mph.
Sunday Night
Partly cloudy, with a low around 37. East wind around 13 mph.
Monday
Sunny, with a high near 51. East northeast wind 8 to 10 mph.
Monday Night
Mostly clear, with a low around 38. East wind around 11 mph.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Mostly sunny, with a high near 53.
Wednesday Night
A chance of rain, mainly after 4am. Mostly cloudy, with a low around 40.
New Year's Day
Rain likely, mainly after 10am. Mostly cloudy, with a high near 48.
Thursday Night
Rain. Snow level 5400 feet lowering to 4800 feet after midnight . Mostly cloudy, with a low around 40.
Friday
Rain, possibly mixed with snow. Snow level 4000 feet. Mostly cloudy, with a high near 43.
Friday Night
Rain and snow likely. Snow level 3500 feet. Mostly cloudy, with a low around 38.
Saturday
Rain and snow likely. Snow level 3400 feet. Mostly cloudy, with a high near 43.
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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 pm PST Dec 27, 2025
9pm PST Dec 27, 2025-6pm PST Jan 3, 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