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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

67°F

19°C

Humidity 31%
Wind Speed NNW 9 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 21 Mar 09:25 AM PDT
Extended Forecast for

3 Miles SSE Clayton CA

  • Tonight

    Tonight: Mostly clear, with a low around 54. West wind 9 to 14 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 72. West wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 72 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55. Southwest wind around 13 mph, with gusts as high as 22 mph.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 71. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. Southwest wind 10 to 13 mph, with gusts as high as 23 mph.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 54. West wind 9 to 14 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 72. West wind 7 to 10 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 55. Southwest wind around 13 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 71. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 54. Southwest wind 10 to 13 mph, with gusts as high as 23 mph.
Tuesday
Sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Mostly sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 52.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Clayton CA
 37.9°N 121.9°W (Elev. 1814 ft)
Last Update:
2:07 pm PDT Mar 21, 2026
Forecast Valid:
4pm PDT Mar 21, 2026-6pm PDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation