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

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Clear

79°F

26°C

Humidity 47%
Wind Speed S 5 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 20 Mar 07:20 PM PDT
Extended Forecast for

5 Miles NE Yountville CA

Heat Advisory March 20, 07:31pm until March 20, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory March 20, 07:31pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 82. North northwest wind 6 to 9 mph becoming west southwest in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. North northwest wind 7 to 9 mph becoming west in the afternoon. Winds could gust as high as 18 mph.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52. West southwest wind 5 to 7 mph.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Monday Night

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

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 61. Light and variable wind becoming west around 6 mph after midnight.
Saturday
Mostly sunny, with a high near 82. North northwest wind 6 to 9 mph becoming west southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 57. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.
Sunday
Sunny, with a high near 78. North northwest wind 7 to 9 mph becoming west in the afternoon. Winds could gust as high as 18 mph.
Sunday Night
Mostly clear, with a low around 52. West southwest wind 5 to 7 mph.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Sunny, with a high near 78.
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 56.
Friday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NE Yountville CA
 38.45°N 122.3°W (Elev. 1207 ft)
Last Update:
2:07 pm PDT Mar 20, 2026
Forecast Valid:
7pm PDT Mar 20, 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