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

43°F

6°C

Humidity 92%
Wind Speed SSW 2 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 14 Apr 10:40 AM PDT
Extended Forecast for

4 Miles S Clayton CA

  • Tonight

    Tonight: Increasing clouds, with a low around 42. South southwest wind 9 to 13 mph, with gusts as high as 23 mph.

    Low: 42 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 65. West southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 65 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. West southwest wind 14 to 17 mph, with gusts as high as 31 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 67. West wind 10 to 15 mph becoming north 16 to 21 mph in the morning. Winds could gust as high as 36 mph.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 42. Northwest wind 10 to 16 mph, with gusts as high as 30 mph.

    Low: 42 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Saturday Night

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

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 42. South southwest wind 9 to 13 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 65. West southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Wednesday Night
Partly cloudy, with a low around 42. West southwest wind 14 to 17 mph, with gusts as high as 31 mph.
Thursday
Sunny, with a high near 67. West wind 10 to 15 mph becoming north 16 to 21 mph in the morning. Winds could gust as high as 36 mph.
Thursday Night
Clear, with a low around 42. Northwest wind 10 to 16 mph, with gusts as high as 30 mph.
Friday
Sunny, with a high near 71.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 74.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
A chance of rain, mainly after 11am. Partly sunny, with a high near 69.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 46.
Monday
A chance of rain. Partly sunny, with a high near 62.
Monday Night
A chance of rain. Partly cloudy, with a low around 44.
Tuesday
A slight chance of rain. Mostly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.95°W (Elev. 1509 ft)
Last Update:
2:16 pm PDT Apr 14, 2026
Forecast Valid:
3pm PDT Apr 14, 2026-6pm PDT Apr 21, 2026
 
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