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

Areas of Heavy Rainfall and Heat Early This Week

Excessive rainfall may produce locally considerable flash flooding over parts of South Texas, the western Gulf Coast, and lower Mississippi River Valley today into Thursday. Rainfall totals of 5 to 10 inches are expected. Hot temperatures may cause heat illnesses over central and northern California and the Pacific Northwest through Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Partly Cloudy

68°F

20°C

Humidity 70%
Wind Speed SSW 9 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 15 Jun 11:23 AM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory June 15, 11:33am until June 18, 05:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory June 15, 11:33am until June 18, 05:00am

    NOW until 5:00am Thu

    Coastal Flood Advisory

  • Today

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. West southwest wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 7am. Otherwise, sunny, with a high near 86. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 86 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Areas of fog after 1am. Otherwise, increasing clouds, with a low around 53. West southwest wind around 6 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear
    then Areas
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 83 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Widespread fog, mainly after 3am. Otherwise, mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear
    then Fog

  • Thursday

    Thursday: Areas of fog before 8am. Otherwise, sunny, with a high near 80.

    High: 80 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Widespread fog, mainly after 5am. Otherwise, partly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Clear
    then Fog

Detailed Forecast

Today
Sunny, with a high near 86. West southwest wind 3 to 6 mph.
Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. West southwest wind around 6 mph becoming calm in the evening.
Tuesday
Patchy fog before 7am. Otherwise, sunny, with a high near 86. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Tuesday Night
Areas of fog after 1am. Otherwise, increasing clouds, with a low around 53. West southwest wind around 6 mph becoming calm in the evening.
Wednesday
Patchy fog before 8am. Otherwise, sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.
Wednesday Night
Widespread fog, mainly after 3am. Otherwise, mostly clear, with a low around 52.
Thursday
Areas of fog before 8am. Otherwise, sunny, with a high near 80.
Thursday Night
Widespread fog, mainly after 5am. Otherwise, partly cloudy, with a low around 51.
Juneteenth
Widespread fog, mainly before 7am. Otherwise, mostly sunny, with a high near 76.
Friday Night
Widespread fog, mainly after 2am. Otherwise, mostly clear, with a low around 50.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 79.
Saturday Night
Widespread fog. Otherwise, mostly clear, with a low around 49.
Sunday
Areas of fog. Otherwise, sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
Last Update:
11:27 am PDT Jun 15, 2026
Forecast Valid:
11am PDT Jun 15, 2026-6pm PDT Jun 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation