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

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

79°F

26°C

Humidity 39%
Wind Speed SSE 4 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 09 Sep 10:00 PM PDT
Extended Forecast for

Yountville CA

Heat Advisory September 9, 10:23pm until September 10, 10:00pm
Coastal Flood Advisory September 9, 10:23pm until September 10, 01:00am
Click here for hazard details and duration
Heat Advisory
Coastal Flood Advisory
  •  
    Heat Advisory September 9, 10:23pm until September 10, 10:00pm
    Coastal Flood Advisory September 9, 10:23pm until September 10, 01:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 94. Calm wind becoming south 5 to 7 mph in the morning.

    High: 94 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 55. Light south southeast wind.

    Low: 55 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 85. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 85 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 54. Light west southwest wind.

    Low: 54 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 70. Calm wind.
Thursday
Mostly sunny, with a high near 94. Calm wind becoming south 5 to 7 mph in the morning.
Thursday Night
Increasing clouds, with a low around 55. Light south southeast wind.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 85. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 54. Light west southwest wind.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 53.
Monday
Sunny, with a high near 83.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 51.
Tuesday
Patchy fog. Otherwise, mostly sunny, with a high near 77.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 50.
Wednesday
Patchy fog. Otherwise, mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Yountville CA
 38.39°N 122.37°W (Elev. 558 ft)
Last Update:
9:07 pm PDT Sep 9, 2026
Forecast Valid:
10pm PDT Sep 9, 2026-6pm PDT Sep 16, 2026
 
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