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

San Jose / Reid / Hillv (KRHV)

Lat: 37.33333°NLon: 121.81667°WElev: 135.0ft.

Clear

90°F

32°C

Humidity 33%
Wind Speed NW 6 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 20 Mar 04:47 PM PDT
Extended Forecast for

4 Miles SW Mount Hamilton CA

Heat Advisory March 20, 05:10pm until March 20, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory March 20, 05:10pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Calm wind becoming west northwest 5 to 8 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 47. Northwest wind 5 to 7 mph becoming calm  after midnight.

    Low: 47 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48. West northwest wind 5 to 7 mph becoming calm  in the evening.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 79.

    High: 79 °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 81.

    High: 81 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 55. West northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 80. Calm wind becoming west northwest 5 to 8 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 47. Northwest wind 5 to 7 mph becoming calm after midnight.
Sunday
Sunny, with a high near 78. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 48. West northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Mount Hamilton CA
 37.3°N 121.69°W (Elev. 1401 ft)
2:07 pm PDT Mar 20, 2026
5pm PDT Mar 20, 2026-6pm PDT Mar 27, 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