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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

57°F

14°C

Humidity 87%
Wind Speed N 6 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 17 Sep 08:00 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

  • Today

    Today: Areas of fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 76. Light and variable wind.

    High: 76 °F

    Areas Fog
    then Sunny

  • Tonight

    Tonight: Areas of fog after 10pm. Otherwise, mostly clear, with a low around 49. Calm wind.

    Low: 49 °F

    Areas Fog

  • Friday

    Friday: Areas of fog before 9am. Otherwise, sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.

    High: 85 °F

    Areas Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 53. West wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 89. Light and variable wind.

    High: 89 °F

    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 83.

    High: 83 °F

    Areas Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 86.

    High: 86 °F

    Areas Fog
    then Sunny

Detailed Forecast

Today
Areas of fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 76. Light and variable wind.
Tonight
Areas of fog after 10pm. Otherwise, mostly clear, with a low around 49. Calm wind.
Friday
Areas of fog before 9am. Otherwise, sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 53. West wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 89. Light and variable wind.
Saturday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 52.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 83.
Sunday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 51.
Monday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 86.
Monday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 50.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
Last Update:
1:27 am PDT Sep 17, 2026
Forecast Valid:
8am PDT Sep 17, 2026-6pm PDT Sep 23, 2026
 
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Additional Resources

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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