Significant Winter Storm to Bring Heavy Snow and Ice Impacts; Dangerously Cold Temperatures Expands Across the East

A significant, long-duration winter storm will bring widespread heavy snow, sleet, and freezing rain from the Southern Rockies to New England through Monday. Widespread travel disruptions, prolonged power outages, and vast tree damage is likely. Frigid temperatures, gusty winds, and dangerous wind chills will expand from the north-central US to the Southern Plains, MS Valley, and Midwest. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

55°F

13°C

Humidity 27%
Wind Speed NNW 7 MPH
Barometer NA
Dewpoint 22°F (-6°C)
Visibility NA
Last update 23 Jan 12:50 AM PST
Extended Forecast for

Clayton CA

  • Overnight

    Overnight: Partly cloudy, with a low around 44. South wind around 7 mph.

    Low: 44 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 56. Calm wind becoming north 5 to 7 mph in the morning.

    High: 56 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42. Light and variable wind becoming northeast 5 to 9 mph after midnight. Winds could gust as high as 23 mph.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 57. North northeast wind 13 to 16 mph, with gusts as high as 30 mph.

    High: 57 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39. East northeast wind 9 to 13 mph, with gusts as high as 28 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly cloudy, with a high near 53.

    High: 53 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 44. South wind around 7 mph.
Friday
Mostly sunny, with a high near 56. Calm wind becoming north 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 42. Light and variable wind becoming northeast 5 to 9 mph after midnight. Winds could gust as high as 23 mph.
Saturday
Sunny, with a high near 57. North northeast wind 13 to 16 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 39. East northeast wind 9 to 13 mph, with gusts as high as 28 mph.
Sunday
Mostly cloudy, with a high near 53.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 58.
Tuesday Night
A slight chance of rain. Mostly cloudy, with a low around 45.
Wednesday
A slight chance of rain. Partly sunny, with a high near 57.
Wednesday Night
Mostly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
12:26 am PST Jan 23, 2026
1am PST Jan 23, 2026-6pm PST Jan 29, 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