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Severe Thunderstorms and Heavy Rainfall Today from the Central Plains into the Tennessee Valley

Severe thunderstorms capable of damaging winds will be possible from the Ozark Plateau east into portions of the Southeast today. Rounds of heavy thunderstorms ahead of a slow moving front will continue locally heavy rainfall and scattered flash flooding potential from the Ozarks to the Ohio and Tennessee Valleys today. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

59°F

15°C

Humidity 87%
Wind Speed SSW 12 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Jul 02:00 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory July 12, 02:28am until July 16, 04:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory July 12, 02:28am until July 16, 04:00am

    NOW until 4:00am Thu

    Coastal Flood Advisory

  • Overnight

    Low: 59 °F

    Cloudy

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.

    High: 89 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Isolated showers after 4am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.

    Low: 62 °F

    Mostly Cloudy
    then Isolated
    Showers

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 93 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. Light and variable wind.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 96.

    High: 96 °F

    Hot

Detailed Forecast

Overnight
Cloudy, with a low around 59. Calm wind.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Isolated showers after 4am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 62. Light and variable wind.
Tuesday
Sunny, with a high near 95.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny and hot, with a high near 96.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 56.
Friday
Mostly sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 56.
Saturday
Mostly sunny, with a high near 86.
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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:
1:26 am PDT Jul 12, 2026
Forecast Valid:
2am PDT Jul 12, 2026-6pm PDT Jul 18, 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