Areas of Dangerous Heat and Severe Thunderstorms

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 before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

64°F

18°C

Humidity 88%
Wind Speed SSW 8 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 27 Aug 02:20 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Overnight

    Overnight: A 20 percent chance of rain after 4am.  Partly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: A 20 percent chance of rain.  Mostly sunny, with a high near 93. Calm wind becoming south southeast 5 to 8 mph in the afternoon.

    High: 93 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain.  Mostly cloudy, with a low around 59. South southwest wind around 5 mph becoming calm  in the evening.

    Low: 59 °F

    Slight Chance
    Rain

  • Friday

    Friday: A 20 percent chance of rain before 11am.  Cloudy, with a high near 84. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 84 °F

    Slight Chance
    Rain then
    Cloudy

  • Friday Night

    Friday Night: Patchy fog after 1am.  Otherwise, partly cloudy, with a low around 51. West southwest wind 5 to 8 mph becoming calm  in the evening.

    Low: 51 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

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

    High: 84 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 1am.  Otherwise, mostly clear, with a low around 51.

    Low: 51 °F

    Clear then
    Patchy Fog

  • Sunday

    Sunday: Areas of fog before 10am.  Otherwise, sunny, with a high near 83.

    High: 83 °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

Detailed Forecast

Overnight
A 20 percent chance of rain after 4am. Partly cloudy, with a low around 59. Calm wind.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 93. Calm wind becoming south southeast 5 to 8 mph in the afternoon.
Thursday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.
Friday
A 20 percent chance of rain before 11am. Cloudy, with a high near 84. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Friday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 51. West southwest wind 5 to 8 mph becoming calm in the evening.
Saturday
Areas of fog before 9am. Otherwise, sunny, with a high near 84.
Saturday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 51.
Sunday
Areas of fog before 10am. Otherwise, sunny, with a high near 83.
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 76.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 47.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 77.
Tuesday Night
Areas of fog. Otherwise, mostly clear, with a low around 49.
Wednesday
Areas of fog. Otherwise, mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
2:26 am PDT Aug 27, 2026
2am PDT Aug 27, 2026-6pm PDT Sep 2, 2026
 
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