National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Widespread Showers and Thunderstorms in Southern California and the Southern Plains into the Mississippi Valley

Isolated strong to severe thunderstorms and widespread heavy rainfall are possible across the southern Plains into Arkansas. Widespread showers with a slight chance of thunderstorms are possible across southern California. Urban flooding, rock and mudslides as well as minor debris flows near burn scars are possible. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

39°F

4°C

Humidity 100%
Wind Speed NNW 9 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Wind Chill33°F (1°C)
Last update 20 Nov 08:15 PM PST
Extended Forecast for

4 Miles SSE Clayton CA

  • Tonight

    Tonight: A 20 percent chance of rain before 10pm. Partly cloudy, with a low around 41. North wind 3 to 6 mph.

    Low: 41 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 49. North wind around 6 mph.

    High: 49 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a steady temperature around 47. Light and variable wind.

    Low: 47 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 50. Light north northeast wind.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 43. Light south southwest wind.

    Low: 43 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Monday Night

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

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of rain before 10pm. Partly cloudy, with a low around 41. North wind 3 to 6 mph.
Friday
Sunny, with a high near 49. North wind around 6 mph.
Friday Night
Mostly clear, with a steady temperature around 47. Light and variable wind.
Saturday
Sunny, with a high near 50. Light north northeast wind.
Saturday Night
Mostly clear, with a low around 43. Light south southwest wind.
Sunday
Mostly sunny, with a high near 49.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 42.
Wednesday
Mostly sunny, with a high near 50.
Wednesday Night
Partly cloudy, with a low around 45.
Thanksgiving Day
Mostly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
2:11 pm PST Nov 20, 2025
Forecast Valid:
8pm PST Nov 20, 2025-6pm PST Nov 27, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation