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

34°F

1°C

Humidity 99%
Wind Speed NE 0 MPH
Barometer NA
Dewpoint 34°F (1°C)
Visibility NA
Last update 27 Dec 06:52 AM PST
Extended Forecast for

17 Miles SSE Agness OR

  • Today

    Today: A slight chance of snow showers before 9am, then a chance of rain and snow showers after 10am.  Snow level rising to 2900 feet in the afternoon. Mostly sunny, with a high near 38. Northeast wind 5 to 8 mph.  Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 38 °F

    Chance
    Rain/Snow

  • Tonight

    Tonight: Increasing clouds, with a steady temperature around 34. East northeast wind around 11 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 43. East northeast wind 11 to 13 mph.

    High: 43 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. East wind around 9 mph.

    Low: 35 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 50. East wind 8 to 10 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Today
A slight chance of snow showers before 9am, then a chance of rain and snow showers after 10am. Snow level rising to 2900 feet in the afternoon. Mostly sunny, with a high near 38. Northeast wind 5 to 8 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Tonight
Increasing clouds, with a steady temperature around 34. East northeast wind around 11 mph.
Sunday
Mostly sunny, with a high near 43. East northeast wind 11 to 13 mph.
Sunday Night
Partly cloudy, with a low around 35. East wind around 9 mph.
Monday
Sunny, with a high near 50. East wind 8 to 10 mph.
Monday Night
Partly cloudy, with a low around 36.
Tuesday
Sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Sunny, with a high near 52.
Wednesday Night
A slight chance of rain after 10pm. Partly cloudy, with a low around 41.
New Year's Day
Rain likely. Snow level 5000 feet. Partly sunny, with a high near 46.
Thursday Night
Rain, possibly mixed with snow. Snow level 4400 feet. Mostly cloudy, with a low around 40.
Friday
Rain and snow. Snow level 3600 feet. Mostly cloudy, with a high near 44.
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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 am PST Dec 27, 2025
7am PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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Additional Resources

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