Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

63°F

17°C

Humidity 82%
Wind Speed SW 4 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 19 Aug 11:20 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Today

    Today: Sunny, with a high near 91. South wind 3 to 5 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 2am.  Otherwise, increasing clouds, with a low around 54. Calm wind.

    Low: 54 °F

    Clear then
    Patchy Fog

  • Thursday

    Thursday: Areas of fog before 9am.  Otherwise, partly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.

    High: 88 °F

    Areas Fog
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 3am.  Otherwise, mostly cloudy, with a low around 55. Light and variable wind.

    Low: 55 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am.  Otherwise, partly sunny, with a high near 86. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am.  Otherwise, partly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Areas of fog before 8am.  Otherwise, sunny, with a high near 87.

    High: 87 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 3am.  Otherwise, mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before 9am.  Otherwise, mostly sunny, with a high near 88.

    High: 88 °F

    Areas Fog
    then Sunny

Detailed Forecast

Today
Sunny, with a high near 91. South wind 3 to 5 mph.
Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 54. Calm wind.
Thursday
Areas of fog before 9am. Otherwise, partly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 55. Light and variable wind.
Friday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 86. Calm wind becoming southwest around 6 mph in the afternoon.
Friday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 53.
Saturday
Areas of fog before 8am. Otherwise, sunny, with a high near 87.
Saturday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 88.
Sunday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 53.
Monday
Areas of fog. Otherwise, partly sunny, with a high near 85.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 52.
Tuesday
Areas of fog. Otherwise, partly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
11:27 am PDT Aug 19, 2026
11am PDT Aug 19, 2026-6pm PDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database