Prolonged Extreme Cold; Eastern U.S. Winter Storm

Another Arctic blast will surge south across the northern Plains tonight, crossing the Midwest and reaching the Gulf Coast Friday night. Dangerously cold temperatures will persist across the eastern U.S. into early February. There is increasing confidence for significant heavy snow across much of the Southern Appalachians, Carolinas, and southern Mid-Atlantic Friday into Sunday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

57°F

14°C

Humidity 28%
Wind Speed N 4 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 29 Jan 03:50 PM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • Tonight

    Tonight: Partly cloudy, with a steady temperature around 52. Northeast wind around 6 mph.

    Low: 52 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 60. East northeast wind around 8 mph.

    High: 60 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a steady temperature around 53. East wind around 7 mph.

    Low: 53 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 60. East northeast wind 7 to 9 mph.

    High: 60 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 48. Northeast wind around 6 mph becoming southwest after midnight.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a steady temperature around 52. Northeast wind around 6 mph.
Friday
Mostly sunny, with a high near 60. East northeast wind around 8 mph.
Friday Night
Mostly cloudy, with a steady temperature around 53. East wind around 7 mph.
Saturday
Mostly sunny, with a high near 60. East northeast wind 7 to 9 mph.
Saturday Night
Partly cloudy, with a low around 48. Northeast wind around 6 mph becoming southwest after midnight.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Sunny, with a high near 60.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Sunny, with a high near 61.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
12:27 pm PST Jan 29, 2026
4pm PST Jan 29, 2026-6pm PST Feb 5, 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