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

Storm Impacting the Southwest U.S.

A slow moving weather disturbance will continue to bring periodic rain showers, a few isolated thunderstorms, and a localized flash flooding across the Southwest. The threat will expand into the Southern Plains Wednesday night. Moderate to heavy snow across the Sierra Nevada and southern Utah Ranges will continue into the overnight period. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

43°F

6°C

Humidity 86%
Wind Speed W 5 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Wind Chill40°F (4°C)
Last update 18 Nov 09:25 PM PST
Extended Forecast for

4 Miles S Clayton CA

  • Tonight

    Tonight: Partly cloudy, with a low around 43. South wind around 6 mph.

    Low: 43 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 46. Light south wind.

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely after 10pm. Cloudy, with a steady temperature around 46. South southwest wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Rain Likely

  • Thursday

    Thursday: Rain likely, mainly before 10am. Mostly cloudy, with a high near 48. South wind around 7 mph becoming west northwest in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Rain Likely
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 44. North northeast wind around 6 mph.

    Low: 44 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Saturday Night

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

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. South wind around 6 mph.
Wednesday
Partly sunny, with a high near 46. Light south wind.
Wednesday Night
Rain likely after 10pm. Cloudy, with a steady temperature around 46. South southwest wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Rain likely, mainly before 10am. Mostly cloudy, with a high near 48. South wind around 7 mph becoming west northwest in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Partly cloudy, with a low around 44. North northeast wind around 6 mph.
Friday
Sunny, with a high near 48.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 50.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Sunny, with a high near 50.
Sunday Night
Mostly clear, with a low around 45.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
2:38 pm PST Nov 18, 2025
Forecast Valid:
9pm PST Nov 18, 2025-6pm PST Nov 25, 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