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 >

Hazardous Weather Conditions

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

Lat: 37.66083°NLon: 122.11833°WElev: 46.0ft.

Clear

68°F

20°C

Humidity 64%
Wind Speed N 0 MPH
Barometer 30.0 in (1015.92 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 20 Mar 09:00 AM PDT
Extended Forecast for

Castro Valley CA

Heat Advisory March 20, 09:20am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 09:20am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 58. South southwest wind 3 to 5 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 82. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52. West southwest wind 5 to 9 mph.

    Low: 52 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 80 °F

    Sunny

  • Sunday Night

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

    Low: 50 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Monday Night

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

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 93. Calm wind becoming west around 6 mph in the afternoon.
Tonight
Mostly clear, with a low around 58. South southwest wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 82. Calm wind becoming west 5 to 9 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 52. West southwest wind 5 to 9 mph.
Sunday
Sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 50.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 53.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.71°N 122.08°W (Elev. 397 ft)
2:22 am PDT Mar 20, 2026
9am PDT Mar 20, 2026-6pm PDT Mar 26, 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