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

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

35°F

2°C

Humidity 100%
Wind Speed NNW 18 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Wind Chill24°F (-4°C)
Last update 27 Dec 06:35 PM PST
Extended Forecast for

2 Miles SSW Clayton CA

  • Tonight

    Tonight: Partly cloudy, with a low around 39. North northeast wind around 5 mph becoming calm  in the evening.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 49. North northeast wind 3 to 7 mph.

    High: 49 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. Calm wind becoming east northeast around 5 mph after midnight.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50. Northeast wind 7 to 9 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Patchy frost before 8am.  Otherwise, mostly sunny, with a high near 51.

    High: 51 °F

    Patchy Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 51.

    High: 51 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of rain.  Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 39. North northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 49. North northeast wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 37. Calm wind becoming east northeast around 5 mph after midnight.
Monday
Sunny, with a high near 50. Northeast wind 7 to 9 mph.
Monday Night
Mostly clear, with a low around 37. East northeast wind 3 to 5 mph.
Tuesday
Patchy frost before 8am. Otherwise, mostly sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 39.
Wednesday
Mostly cloudy, with a high near 51.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 42.
New Year's Day
Rain likely, mainly after 10am. Mostly cloudy, with a high near 51.
Thursday Night
Rain likely. Mostly cloudy, with a low around 45.
Friday
A chance of rain. Partly sunny, with a high near 52.
Friday Night
A chance of rain. Mostly cloudy, with a low around 44.
Saturday
A chance of rain. Partly sunny, with a high near 51.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
12:27 pm PST Dec 27, 2025
6pm 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