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 68%
Wind Speed NNW 19 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Wind Chill24°F (-4°C)
Last update 28 Dec 04:25 AM PST
Extended Forecast for

4 Miles S Clayton CA

  • Today

    Today: Sunny, with a high near 47. North wind around 7 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 43. Northeast wind 5 to 7 mph.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 48. Northeast wind 7 to 9 mph.

    High: 48 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. East northeast wind around 6 mph.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 50. East northeast wind around 9 mph.

    High: 50 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain.  Mostly cloudy, with a low around 43.

    Low: 43 °F

    Chance Rain

  • New Year's Day

    New Year's Day: Rain likely, mainly after 10am.  Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain Likely

Detailed Forecast

Today
Sunny, with a high near 47. North wind around 7 mph.
Tonight
Mostly clear, with a steady temperature around 43. Northeast wind 5 to 7 mph.
Monday
Sunny, with a high near 48. Northeast wind 7 to 9 mph.
Monday Night
Mostly clear, with a low around 38. East northeast wind around 6 mph.
Tuesday
Sunny, with a high near 50. East northeast wind around 9 mph.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Partly sunny, with a high near 50.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 43.
New Year's Day
Rain likely, mainly after 10am. Mostly cloudy, with a high near 50.
Thursday Night
Rain likely. Mostly cloudy, with a low around 45.
Friday
A chance of rain. Partly sunny, with a high near 50.
Friday Night
A chance of rain. Mostly cloudy, with a low around 45.
Saturday
A chance of rain. Partly sunny, with a high near 50.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
12:27 am PST Dec 28, 2025
4am PST Dec 28, 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