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

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

Lat: 38.5°NLon: 122.81667°WElev: 125.0ft.

Clear

90°F

32°C

Humidity 27%
Wind Speed S 8 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 20 Mar 04:00 PM PDT
Extended Forecast for

6 Miles SSW Saint Helena CA

Heat Advisory March 20, 04:17pm until March 20, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory March 20, 04:17pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Light northwest wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 56. West northwest wind 5 to 9 mph becoming light north northwest after midnight. Winds could gust as high as 18 mph.

    Low: 56 °F

    Clear

  • Sunday

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

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52. West southwest wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 62. Light west northwest wind.
Saturday
Mostly sunny, with a high near 80. Light northwest wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Clear, with a low around 56. West northwest wind 5 to 9 mph becoming light north northwest after midnight. Winds could gust as high as 18 mph.
Sunday
Sunny, with a high near 77. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 52. West southwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles SSW Saint Helena CA
 38.43°N 122.52°W (Elev. 1093 ft)
Last Update:
2:07 pm PDT Mar 20, 2026
Forecast Valid:
4pm PDT Mar 20, 2026-6pm PDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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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