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 42%
Wind Speed SW 5 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 20 Mar 02:30 PM PDT
Extended Forecast for

Napa Co. Airport CA

Heat Advisory March 20, 02:50pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 20, 02:50pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 52. Southwest wind 5 to 7 mph.

    Low: 52 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Light southwest wind becoming west southwest 10 to 15 mph in the morning. Winds could gust as high as 21 mph.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 46. West wind 6 to 14 mph, with gusts as high as 18 mph.

    Low: 46 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77. Light west wind becoming west southwest 5 to 9 mph in the afternoon.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °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 48.

    Low: 48 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 88. West southwest wind 5 to 7 mph.
Tonight
Increasing clouds, with a low around 52. Southwest wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 80. Light southwest wind becoming west southwest 10 to 15 mph in the morning. Winds could gust as high as 21 mph.
Saturday Night
Mostly clear, with a low around 46. West wind 6 to 14 mph, with gusts as high as 18 mph.
Sunday
Sunny, with a high near 77. Light west wind becoming west southwest 5 to 9 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Mostly sunny, with a high near 79.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Napa Co. Airport CA
 38.2°N 122.29°W (Elev. 20 ft)
Last Update:
2:07 pm PDT Mar 20, 2026
Forecast Valid:
2pm PDT Mar 20, 2026-6pm PDT Mar 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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