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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

54°F

12°C

Humidity 96%
Wind Speed N 0 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 19 Sep 05:54 AM PDT
Extended Forecast for

Napa CA

  • Today

    Today: Areas of fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 84. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 84 °F

    Areas Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 54. South southwest wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 76. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 76 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 53. Southwest wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 78 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 79.

    High: 79 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 54.

    Low: 54 °F

    Clear then
    Patchy Fog

  • Wednesday

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

    High: 88 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Today
Areas of fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 84. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Tonight
Patchy fog after 4am. Otherwise, increasing clouds, with a low around 54. South southwest wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 76. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 53. Southwest wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 53.
Tuesday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 79.
Tuesday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 54.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 57.
Friday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.29°N 122.29°W (Elev. 20 ft)
Last Update:
1:26 am PDT Sep 19, 2026
Forecast Valid:
6am PDT Sep 19, 2026-6pm PDT Sep 25, 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