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

84°F

29°C

Humidity 45%
Wind Speed SSW 3 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 20 Mar 05:35 PM PDT
Extended Forecast for

5 Miles W Napa Co. Airport CA

Heat Advisory March 20, 05:51pm until March 20, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory March 20, 05:51pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 53 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 81. Light southwest wind becoming west 5 to 10 mph in the afternoon.

    High: 81 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 47. West wind 5 to 9 mph becoming calm after midnight.

    Low: 47 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 47. West southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 47 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, sunny, with a high near 78.

    High: 78 °F

    Areas Fog
    then Sunny

  • Monday Night

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

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Tonight
Increasing clouds, with a low around 53. West southwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 81. Light southwest wind becoming west 5 to 10 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 47. West wind 5 to 9 mph becoming calm after midnight.
Sunday
Sunny, with a high near 78. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 47. West southwest wind 5 to 7 mph becoming calm in the evening.
Monday
Areas of fog before 9am. Otherwise, sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles W Napa Co. Airport CA
 38.21°N 122.38°W (Elev. 3 ft)
Last Update:
2:07 pm PDT Mar 20, 2026
Forecast Valid:
5pm PDT Mar 20, 2026-6pm PDT Mar 27, 2026
 
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