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

82°F

28°C

Humidity 39%
Wind Speed WSW 3 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 20 Mar 02:00 PM PDT
Extended Forecast for

2 Miles NNW Napa CA

Heat Advisory March 20, 02:24pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 02:24pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. West wind around 6 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, sunny, with a high near 80.

    High: 80 °F

    Areas Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 90. Light southwest wind.
Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 54. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. Calm wind becoming west 5 to 8 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 49. West wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 79. Calm wind becoming west southwest around 5 mph in the afternoon.
Sunday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 47.
Monday
Areas of fog before 9am. Otherwise, sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Napa CA
 38.31°N 122.32°W (Elev. 98 ft)
Last Update:
2:07 pm PDT Mar 20, 2026
Forecast Valid:
2pm PDT Mar 20, 2026-6pm PDT Mar 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation