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 >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

77°F

25°C

Humidity 57%
Wind Speed SSW 9 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 21 Mar 02:20 PM PDT
Extended Forecast for

Napa CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 83. West southwest wind 5 to 7 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. West southwest 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 southwest around 6 mph in the afternoon.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 47. Light southwest wind.

    Low: 47 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Sunny, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 83. West southwest wind 5 to 7 mph.
Tonight
Mostly clear, with a low around 49. West southwest wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 79. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 47. Light southwest wind.
Monday
Sunny, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.29°N 122.29°W (Elev. 20 ft)
Last Update:
2:07 pm PDT Mar 21, 2026
Forecast Valid:
2pm PDT Mar 21, 2026-6pm PDT Mar 27, 2026
 
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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