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

San Jose / Reid / Hillv (KRHV)

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

Partly Cloudy

63°F

17°C

Humidity 72%
Wind Speed WNW 4 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 21 Mar 08:47 AM PDT
Extended Forecast for

4 Miles SW Mount Hamilton CA

  • Today

    Today: Mostly sunny, with a high near 79. Calm wind becoming northwest 5 to 8 mph in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Tonight

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

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 49. West northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Clear

  • Monday

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

    High: 78 °F

    Sunny

  • Monday Night

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

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Tuesday Night

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

    Low: 50 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 79. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Tonight
Mostly clear, with a low around 48. North northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 78. Calm wind becoming west northwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 49. West northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 78. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Mount Hamilton CA
 37.3°N 121.69°W (Elev. 1401 ft)
Last Update:
2:22 am PDT Mar 21, 2026
Forecast Valid:
9am PDT Mar 21, 2026-6pm PDT Mar 27, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation