Heavy Rainfall Continues in Hawaii; Severe Thunderstorms and Heavy Rainfall in the Plains and Southern Appalachians

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorms and heavy rainfall will shift into the southern Appalachians today. Strong to severe thunderstorms may produce large hail, scattered wind gusts, and heavy rain today across the northern and central Plains. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

72°F

22°C

Humidity 63%
Wind Speed SSW 9 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 17 Aug 01:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 86. South southwest wind around 5 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Areas of fog after 1am.  Otherwise, increasing clouds, with a low around 52. Calm wind.

    Low: 52 °F

    Partly Cloudy
    then Areas
    Fog

  • Tuesday

    Tuesday: Areas of fog before 9am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 90 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am.  Otherwise, partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Areas of fog before 9am.  Otherwise, mostly sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 90 °F

    Areas Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 2am.  Otherwise, partly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 88.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 86. South southwest wind around 5 mph.
Tonight
Areas of fog after 1am. Otherwise, increasing clouds, with a low around 52. Calm wind.
Tuesday
Areas of fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the afternoon.
Tuesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 54. Calm wind.
Wednesday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the afternoon.
Wednesday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 54.
Thursday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 85.
Friday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Saturday
Areas of fog. Otherwise, sunny, with a high near 86.
Saturday Night
Patchy fog. Otherwise, mostly clear, with a low around 53.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
1:26 pm PDT Aug 17, 2026
2pm PDT Aug 17, 2026-6pm PDT Aug 23, 2026
 
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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