National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

65°F

18°C

Humidity 67%
Wind Speed SSW 8 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 22 Aug 09:54 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Today

    Today: Increasing clouds, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 89 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Increasing clouds, with a low around 56. West wind 5 to 7 mph becoming calm in the evening.

    Low: 56 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.

    High: 91 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Areas of fog after midnight. Otherwise, partly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Clear
    then Areas
    Fog

  • Tuesday

    Tuesday: Areas of fog before 9am. Otherwise, partly sunny, with a high near 86.

    High: 86 °F

    Areas Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after midnight. Otherwise, partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 88.

    High: 88 °F

    Areas Fog
    then Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.
Tonight
Increasing clouds, with a low around 56. West wind 5 to 7 mph becoming calm in the evening.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Patchy fog after 4am. Otherwise, increasing clouds, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.
Monday Night
Areas of fog after midnight. Otherwise, partly cloudy, with a low around 52.
Tuesday
Areas of fog before 9am. Otherwise, partly sunny, with a high near 86.
Tuesday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 53.
Wednesday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
Partly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
Last Update:
9:52 am PDT Aug 22, 2026
Forecast Valid:
10am PDT Aug 22, 2026-6pm PDT Aug 28, 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