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

San Jose / Reid / Hillv (KRHV)

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

Clear

133°F

56°C

Humidity 55%
Wind Speed N 0 MPH
Barometer 30.09 in (1018.96 mb)
Dewpoint 112°F (44°C)
Visibility 10.00 mi
Heat Index289°F (143°C)
Last update 18 Mar 09:57 PM PDT
Extended Forecast for

4 Miles W Mount Hamilton CA

Heat Advisory March 19, 06:15am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 19, 06:15am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 58. Light and variable wind.

    Low: 58 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 90. Calm wind becoming west northwest around 5 mph in the afternoon.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. West northwest wind around 6 mph becoming calm  in the evening.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 82. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 89. Calm wind becoming west northwest around 6 mph in the afternoon.
Tonight
Clear, with a low around 58. Light and variable wind.
Friday
Sunny, with a high near 90. Calm wind becoming west northwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 58. West northwest wind around 6 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 82. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 79.
Sunday Night
Mostly clear, with a low around 51.
Monday
Sunny, with a high near 81.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Mount Hamilton CA
 37.34°N 121.73°W (Elev. 2011 ft)
5:12 am PDT Mar 19, 2026
6am 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