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.

Clear

72°F

22°C

Humidity 64%
Wind Speed SSW 19 MPH
Barometer 29.86 in (1011.18 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 17 Jun 03:20 PM PDT
Extended Forecast for

Napa CA

Coastal Flood Advisory June 17, 03:40pm until June 18, 05:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory June 17, 03:40pm until June 18, 05:00am

    NOW until 5:00am Thu

    Coastal Flood Advisory

  • Tonight

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 73. Light west southwest wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 73 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 54. West southwest wind 5 to 10 mph, with gusts as high as 21 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: Mostly cloudy, then gradually becoming sunny, with a high near 71. Light west southwest wind becoming southwest 5 to 9 mph in the morning.

    High: 71 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 52. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.

    Low: 52 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, sunny, with a high near 76.

    High: 76 °F

    Patchy Fog
    then Sunny

  • Saturday Night

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

    Low: 51 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 80.

    High: 80 °F

    Areas Fog
    then Sunny

Detailed Forecast

Tonight
Patchy fog between 2am and 5am. Otherwise, increasing clouds, with a low around 53. South southwest wind 5 to 9 mph becoming light west southwest after midnight.
Thursday
Patchy fog before 9am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 73. Light west southwest wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Increasing clouds, with a low around 54. West southwest wind 5 to 10 mph, with gusts as high as 21 mph.
Juneteenth
Mostly cloudy, then gradually becoming sunny, with a high near 71. Light west southwest wind becoming southwest 5 to 9 mph in the morning.
Friday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 52. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Saturday
Patchy fog before 8am. Otherwise, sunny, with a high near 76.
Saturday Night
Patchy fog after midnight. Otherwise, mostly clear, with a low around 51.
Sunday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 80.
Sunday Night
Patchy fog after midnight. Otherwise, mostly clear, with a low around 52.
Monday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 80.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 52.
Tuesday
Areas of fog. Otherwise, sunny, with a high near 82.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 53.
Wednesday
Patchy fog. Otherwise, sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.29°N 122.29°W (Elev. 20 ft)
Last Update:
2:05 pm PDT Jun 17, 2026
Forecast Valid:
3pm PDT Jun 17, 2026-6pm PDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation