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

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

51°F

11°C

Humidity 28%
Wind Speed NNE 3 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Last update 17 Apr 08:05 PM PDT
Extended Forecast for

4 Miles S Clayton CA

  • Tonight

    Tonight: Partly cloudy, with a low around 43. West northwest wind around 6 mph becoming light and variable after midnight.

    Low: 43 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 75. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 48. Southwest wind around 7 mph.

    Low: 48 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. West southwest wind 7 to 11 mph, with gusts as high as 22 mph.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 11pm. Partly cloudy, with a low around 46. West southwest wind 9 to 14 mph, with gusts as high as 25 mph.

    Low: 46 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 50 percent chance of showers. Partly sunny, with a high near 69. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 69 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Rain likely. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain before 11am, then showers and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 61.

    High: 61 °F

    Showers

  • Tuesday Night

    Tuesday Night: A chance of rain. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. West northwest wind around 6 mph becoming light and variable after midnight.
Saturday
Mostly sunny, with a high near 75. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 48. Southwest wind around 7 mph.
Sunday
Partly sunny, with a high near 73. West southwest wind 7 to 11 mph, with gusts as high as 22 mph.
Sunday Night
A 20 percent chance of showers after 11pm. Partly cloudy, with a low around 46. West southwest wind 9 to 14 mph, with gusts as high as 25 mph.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 69. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Rain likely. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Tuesday
Rain before 11am, then showers and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 61.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 45.
Wednesday
A chance of rain. Mostly sunny, with a high near 63.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 44.
Friday
Sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.95°W (Elev. 1509 ft)
Last Update:
1:26 pm PDT Apr 17, 2026
Forecast Valid:
9pm PDT Apr 17, 2026-6pm PDT Apr 24, 2026
 
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