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

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

63°F

17°C

Humidity 75%
Wind Speed S 6 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 29 Jun 09:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Tonight

    Tonight: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 51. South southwest wind around 6 mph becoming calm in the evening.

    Low: 51 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 50. Southwest wind around 6 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 1am. Otherwise, mostly clear, with a low around 50.

    Low: 50 °F

    Clear then
    Patchy Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 86.

    High: 86 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 53.

    Low: 53 °F

    Clear then
    Patchy Fog

Detailed Forecast

Tonight
Mostly clear, with a low around 55. Calm wind.
Tuesday
Sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 51. South southwest wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 84. Calm wind becoming south southwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 50. Southwest wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 50.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 86.
Friday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 53.
Independence Day
Patchy fog before 7am. Otherwise, sunny, with a high near 88.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 53.
Sunday
Areas of fog. Otherwise, mostly sunny, with a high near 85.
Sunday Night
Patchy fog. Otherwise, partly cloudy, with a low around 53.
Monday
Patchy fog. Otherwise, mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
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:
1:26 pm PDT Jun 29, 2026
Forecast Valid:
10pm PDT Jun 29, 2026-6pm PDT Jul 6, 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