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

66°F

19°C

Humidity 3%
Wind Speed W 7 MPH
Barometer NA
Dewpoint -14°F (-26°C)
Visibility NA
Last update 22 Mar 01:35 AM PDT
Extended Forecast for

3 Miles S Clayton CA

  • Today

    Today: Sunny, with a high near 73. North northeast wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    High: 73 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 55. Southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 73. West southwest wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 74. Southwest wind around 10 mph, with gusts as high as 20 mph.

    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 73.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 73. North northeast wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Tonight
Mostly clear, with a low around 55. Southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 73. West southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 55. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Tuesday
Sunny, with a high near 74. Southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Mostly sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Clayton CA
 37.9°N 121.92°W (Elev. 1900 ft)
Last Update:
2:27 am PDT Mar 22, 2026
Forecast Valid:
7am PDT Mar 22, 2026-6pm PDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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National Digital Forecast Database Weather Element Forecast

Chance of Precipitation