Early Spring Heat Wave in the Southwest U.S.; Critical Fire Weather in the Central Rockies and Plains

An unusual early Spring heat wave will continue much above-normal temperatures over the Southwest U.S. through early next week. Many locations are likely to set records for the highest-ever March temperature. Periods of critical fire weather will persist from the central Rockies to the central Plains through Saturday as gusty winds and low relative humidity continue. Read More >

Hazardous Weather Conditions

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

74°F

23°C

Humidity 22%
Wind Speed ESE 1 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 19 Mar 10:10 AM PDT
Extended Forecast for

2 Miles S Clayton CA

Heat Advisory March 19, 02:11pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 19, 02:11pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 59. Northwest wind around 6 mph becoming calm  after midnight.

    Low: 59 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 90. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Southwest wind around 8 mph.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 83. West wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 83 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Sunday Night

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

    Low: 52 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 90. North wind around 6 mph.
Tonight
Clear, with a low around 59. Northwest wind around 6 mph becoming calm after midnight.
Friday
Sunny, with a high near 90. Calm wind becoming northwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 60. Southwest wind around 8 mph.
Saturday
Mostly sunny, with a high near 83. West wind 7 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 54.
Sunday
Sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 53.
Wednesday
Sunny, with a high near 76.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Clayton CA
 37.92°N 121.93°W (Elev. 600 ft)
2:08 pm PDT Mar 19, 2026
2pm PDT Mar 19, 2026-6pm PDT Mar 25, 2026
 
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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