Major Winter Storm to Bring Heavy Snow and Ice Impacts; Dangerously Cold in the North-Central U.S.

A large, long-duration winter storm is expected to bring widespread heavy snow, sleet, and freezing rain from the Southern Rockies/Plains into the Mid-South beginning Friday, spreading eastward to the Mid-Atlantic and New England this weekend. An Arctic front will bring frigid temperatures and gusty winds that will lead to dangerous wind chills from the Northern Plains and Upper Midwest. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

50°F

10°C

Humidity 38%
Wind Speed NW 4 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Wind Chill49°F (9°C)
Last update 22 Jan 05:20 AM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • Today

    Today: Mostly sunny, with a high near 59. West northwest wind 3 to 5 mph.

    High: 59 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 43. West southwest wind around 7 mph.

    Low: 43 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 53. West wind around 6 mph becoming north northeast in the morning.

    High: 53 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42. West northwest wind 6 to 8 mph.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 55. North wind 11 to 14 mph, with gusts as high as 29 mph.

    High: 55 °F

    Sunny

  • Saturday Night

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

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 52.

    High: 52 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 59. West northwest wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 43. West southwest wind around 7 mph.
Friday
Mostly sunny, with a high near 53. West wind around 6 mph becoming north northeast in the morning.
Friday Night
Mostly clear, with a low around 42. West northwest wind 6 to 8 mph.
Saturday
Sunny, with a high near 55. North wind 11 to 14 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Partly sunny, with a high near 52.
Sunday Night
Mostly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Partly sunny, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 45.
Wednesday
A chance of rain. Mostly cloudy, with a high near 55.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.9°N 121.9°W (Elev. 1814 ft)
3:11 am PST Jan 22, 2026
5am PST Jan 22, 2026-6pm PST Jan 28, 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