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

Areas of Severe Thunderstorms and Excessive Rainfall; Heat Wave Builds in the Intermountain West and Plains

A slow moving front will bring rounds of strong to severe thunderstorms and heavy rainfall to the central Plains eastward to the east-central U.S.. The first widespread significant heat wave of summer for the Intermountain West and Plains is expected to develop today and expand through next week. Dangerous heat will continue to impact portions of the Southwest and Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Mostly Cloudy

66°F

19°C

Humidity 65%
Wind Speed SSW 14 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 10 Jul 11:06 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory July 10, 11:19am until July 16, 04:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory July 10, 11:19am until July 16, 04:00am

    NOW until 4:00am Thu

    Coastal Flood Advisory

  • Today

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 53. Southwest wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 92 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 91 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 92.

    High: 92 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 88. South wind 5 to 7 mph.
Tonight
Increasing clouds, with a low around 53. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Partly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.
Saturday Night
Increasing clouds, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 63.
Monday
Mostly cloudy, with a high near 92.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Sunny and hot, with a high near 96.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 91.
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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:
2:16 am PDT Jul 10, 2026
Forecast Valid:
11am PDT Jul 10, 2026-6pm PDT Jul 16, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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Chance of Precipitation