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 >

Hazardous Weather Conditions

Current conditions at

Berkeley Lab (LBNL1)

Lat: 37.8771°NLon: 122.2486°WElev: 888.0ft.

NA

79°F

26°C

Humidity 48%
Wind Speed W 3 MPH
Barometer NA
Dewpoint 58°F (14°C)
Visibility NA
Heat Index80°F (27°C)
Last update 20 Mar 12:30 PM PDT
Extended Forecast for

2 Miles NNW Hercules CA

Heat Advisory March 20, 12:55pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 12:55pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 56. South southwest wind around 7 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 79. West southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52. Southwest wind 7 to 13 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 75. West southwest wind 3 to 7 mph.

    High: 75 °F

    Sunny

  • Sunday Night

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

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Monday Night

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

    Low: 54 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 88. Light and variable wind becoming west around 6 mph.
Tonight
Increasing clouds, with a low around 56. South southwest wind around 7 mph.
Saturday
Mostly sunny, with a high near 79. West southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 52. Southwest wind 7 to 13 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 75. West southwest wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 52.
Thursday
Mostly sunny, with a high near 77.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Hercules CA
 38.02°N 122.27°W (Elev. 92 ft)
Last Update:
11:52 am PDT Mar 20, 2026
Forecast Valid:
12pm PDT Mar 20, 2026-6pm PDT Mar 26, 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