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

73°F

23°C

Humidity 21%
Wind Speed NNW 8 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Last update 20 Mar 07:40 PM PDT
Extended Forecast for

4 Miles S Clayton CA

  • Today

    Today: Mostly sunny, with a high near 71. West southwest wind 8 to 14 mph becoming north in the morning. Winds could gust as high as 24 mph.

    High: 71 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 54. West wind 10 to 16 mph becoming north after midnight. Winds could gust as high as 29 mph.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 69. West northwest wind around 9 mph, with gusts as high as 18 mph.

    High: 69 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 50. Southwest wind around 14 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67. Southwest wind 9 to 13 mph, with gusts as high as 22 mph.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 71. West southwest wind 8 to 14 mph becoming north in the morning. Winds could gust as high as 24 mph.
Tonight
Mostly clear, with a low around 54. West wind 10 to 16 mph becoming north after midnight. Winds could gust as high as 29 mph.
Sunday
Sunny, with a high near 69. West northwest wind around 9 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 50. Southwest wind around 14 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 67. Southwest wind 9 to 13 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 69.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Mostly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 68.
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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:
2:22 am PDT Mar 21, 2026
Forecast Valid:
5am PDT Mar 21, 2026-6pm PDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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