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

Hot Temperatures in the Northwest U.S.; Excessive Rainfall Potential in the Southwest U.S.

Hot to extremely hot daytime temperatures remain in place across coastal southern California and the interior Northwest, with the Northwest carrying the potential for record-breaking high temperatures. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring a marginal to slight risk of excessive rainfall across the southwest U.S. this week. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

61°F

16°C

Humidity 87%
Wind Speed W 10 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 03 Sep 01:35 AM PDT
Extended Forecast for

3 Miles SSE Yountville CA

  • Overnight

    Overnight: Mostly cloudy, with a low around 55. Light south southeast wind.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 86. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 86 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 54. Calm wind becoming southeast around 5 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy through mid morning, then gradual clearing, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 84 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55. West southwest wind 5 to 7 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 55.

    Low: 55 °F

    Clear then
    Patchy Fog

Detailed Forecast

Overnight
Mostly cloudy, with a low around 55. Light south southeast wind.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 86. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
Increasing clouds, with a low around 54. Calm wind becoming southeast around 5 mph.
Thursday
Cloudy through mid morning, then gradual clearing, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 55. West southwest wind 5 to 7 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 81.
Friday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 54.
Saturday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82.
Saturday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 55.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 82.
Sunday Night
Patchy fog. Otherwise, partly cloudy, with a low around 55.
Monday
Patchy fog. Otherwise, mostly sunny, with a high near 81.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 55.
Tuesday
Patchy fog. Otherwise, mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Yountville CA
 38.35°N 122.33°W (Elev. 105 ft)
Last Update:
1:26 am PDT Sep 3, 2025
Forecast Valid:
1am PDT Sep 3, 2025-6pm PDT Sep 9, 2025
 
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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