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

LA HONDA (LAHC1)

Lat: 37.30523°NLon: 122.25525°WElev: 804.0ft.

NA

69°F

21°C

Humidity 49%
Wind Speed NE 2 MPH
Barometer NA
Dewpoint 49°F (9°C)
Visibility NA
Last update 20 Mar 07:07 AM PDT
Extended Forecast for

Portola Valley CA

Heat Advisory March 20, 07:45am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 07:45am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 56. Calm wind.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 77. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. West northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Monday Night

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

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 90. Light and variable wind.
Tonight
Mostly clear, with a low around 56. Calm wind.
Saturday
Mostly sunny, with a high near 77. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.
Saturday Night
Mostly clear, with a low around 49. West northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 77. Calm wind becoming northwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 48.
Monday
Sunny, with a high near 75.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Clear, with a low around 50.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portola Valley CA
 37.37°N 122.22°W (Elev. 597 ft)
Last Update:
2:22 am PDT Mar 20, 2026
Forecast Valid:
7am 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