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 37%
Wind Speed NW 3 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 22 Jan 05:35 AM PST
Extended Forecast for

2 Miles SSW Clayton CA

  • Today

    Today: Mostly sunny, with a high near 62. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 44. South southwest wind around 6 mph.

    Low: 44 °F

    Partly Cloudy

  • Friday

    Friday: Patchy fog between 9am and noon.  Otherwise, mostly sunny, with a high near 55. Light and variable wind becoming north around 5 mph in the afternoon.

    High: 55 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. West northwest wind around 6 mph.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 58. North northeast wind 9 to 14 mph, with gusts as high as 26 mph.

    High: 58 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

  • Sunday Night

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

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 62. Calm wind becoming northwest around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 44. South southwest wind around 6 mph.
Friday
Patchy fog between 9am and noon. Otherwise, mostly sunny, with a high near 55. Light and variable wind becoming north around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 43. West northwest wind around 6 mph.
Saturday
Sunny, with a high near 58. North northeast wind 9 to 14 mph, with gusts as high as 26 mph.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Partly sunny, with a high near 55.
Sunday Night
Mostly cloudy, with a low around 41.
Monday
Partly sunny, with a high near 57.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Partly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
A chance of rain. Mostly cloudy, with a high near 57.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Clayton CA
 37.91°N 121.96°W (Elev. 1299 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