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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. 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 75%
Wind Speed SSW 4 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 02 Aug 08:54 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Today

    Today: Sunny and hot, with a high near 99. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 99 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 60. West southwest wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog between 3am and 4am. Otherwise, mostly clear, with a low around 53.

    Low: 53 °F

    Clear then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 94.

    High: 94 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Today
Sunny and hot, with a high near 99. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Tonight
Mostly clear, with a low around 60. West southwest wind around 5 mph becoming calm in the evening.
Monday
Sunny and hot, with a high near 100. Calm wind becoming south southwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 95. Calm wind becoming south southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Patchy fog between 3am and 4am. Otherwise, mostly clear, with a low around 53.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 56.
Friday
Sunny and hot, with a high near 97.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny and hot, with a high near 97.
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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:
2:34 am PDT Aug 2, 2026
Forecast Valid:
9am PDT Aug 2, 2026-6pm PDT Aug 8, 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

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation