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

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

59°F

15°C

Humidity 87%
Wind Speed NW 8 MPH
Barometer 29.91 in (1012.87 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 17 Jun 08:20 AM PDT
Extended Forecast for

3 Miles SSE Napa CA

Coastal Flood Advisory June 17, 08:31am until June 18, 05:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory June 17, 08:31am until June 18, 05:00am

    NOW until 5:00am Thu

    Coastal Flood Advisory

  • Today

    High: 74 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. West southwest wind 5 to 10 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy through mid morning, then gradual clearing, with a high near 72. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 72 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 54. West southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 70. Southwest wind 5 to 11 mph, with gusts as high as 18 mph.

    High: 70 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 75.

    High: 75 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 51.

    Low: 51 °F

    Clear then
    Patchy Fog

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 74. Light west southwest wind becoming south southwest 5 to 10 mph in the morning.
Tonight
Increasing clouds, with a low around 54. West southwest wind 5 to 10 mph.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 72. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.
Thursday Night
Increasing clouds, with a low around 54. West southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Juneteenth
Mostly sunny, with a high near 70. Southwest wind 5 to 11 mph, with gusts as high as 18 mph.
Friday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 53.
Saturday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 75.
Saturday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 51.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 78.
Sunday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 52.
Monday
Areas of fog. Otherwise, mostly sunny, with a high near 77.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 52.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Napa CA
 38.25°N 122.27°W (Elev. 59 ft)
Last Update:
7:49 am PDT Jun 17, 2026
Forecast Valid:
8am PDT Jun 17, 2026-6pm PDT Jun 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation