Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

70°F

21°C

Humidity 65%
Wind Speed SW 5 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 27 Aug 09:54 AM PDT
Extended Forecast for

4 Miles SE Saint Helena CA

  • Today

    Today: Mostly sunny, with a high near 94. Calm wind becoming southeast 5 to 9 mph in the afternoon.

    High: 94 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 60. South southeast wind around 5 mph becoming calm  after midnight.

    Low: 60 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers before 11am.  Cloudy, with a high near 86. Light and variable wind becoming southwest around 6 mph in the afternoon.

    High: 86 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Friday Night

    Friday Night: Patchy fog after 1am.  Otherwise, cloudy during the early evening, then gradual clearing, with a low around 52. West southwest wind 5 to 10 mph becoming light and variable  in the evening.

    Low: 52 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Areas of fog before 9am.  Otherwise, sunny, with a high near 85. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 85 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 1am.  Otherwise, mostly clear, with a low around 52.

    Low: 52 °F

    Clear then
    Patchy Fog

  • Sunday

    Sunday: Areas of fog before 9am.  Otherwise, sunny, with a high near 84.

    High: 84 °F

    Areas Fog
    then Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 11pm.  Otherwise, mostly clear, with a low around 50.

    Low: 50 °F

    Patchy Fog

  • Monday

    Monday: Areas of fog before 11am.  Otherwise, mostly sunny, with a high near 77.

    High: 77 °F

    Areas Fog
    then Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 94. Calm wind becoming southeast 5 to 9 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 60. South southeast wind around 5 mph becoming calm after midnight.
Friday
A 20 percent chance of showers before 11am. Cloudy, with a high near 86. Light and variable wind becoming southwest around 6 mph in the afternoon.
Friday Night
Patchy fog after 1am. Otherwise, cloudy during the early evening, then gradual clearing, with a low around 52. West southwest wind 5 to 10 mph becoming light and variable in the evening.
Saturday
Areas of fog before 9am. Otherwise, sunny, with a high near 85. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 52.
Sunday
Areas of fog before 9am. Otherwise, sunny, with a high near 84.
Sunday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 50.
Monday
Areas of fog before 11am. Otherwise, mostly sunny, with a high near 77.
Monday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 48.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 79.
Tuesday Night
Areas of fog. Otherwise, mostly clear, with a low around 50.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Saint Helena CA
 38.45°N 122.41°W (Elev. 157 ft)
6:47 am PDT Aug 27, 2026
10am PDT Aug 27, 2026-6pm PDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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