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

Pacific Storm System Impacting the Western U.S.; Critical to Extremely Critical Fire Weather in the Central U.S.

A Pacific storm will move through the western U.S. today and Tuesday with areas of heavy mountain snow, gusty to high winds, and lower elevation rain. Ahead of this storm, gusty winds and dry conditions over the central and southern Plains will contribute to widespread critical to extremely critical fire weather through Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Rain

59°F

15°C

Humidity 67%
Wind Speed SSW 17 MPH
Barometer 30.0 in (1015.92 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 17 Mar 12:20 PM PDT
Extended Forecast for

Napa CA

Frost Advisory March 18, 02:00am until March 18, 09:00am
Click here for hazard details and duration
Frost Advisory

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 56. West southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 56 °F

    Showers
    Likely

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Patchy frost after 5am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 35. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 35 °F

    Slight Chance
    T-storms then
    Patchy Frost

  • Tuesday

    Tuesday: Areas of frost before 9am. Otherwise, sunny, with a high near 61. Light and variable wind.

    High: 61 °F

    Areas Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 1am. Otherwise, mostly clear, with a low around 36. Light west northwest wind.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Areas of fog before 9am. Patchy frost before 8am. Otherwise, partly sunny, with a high near 59. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 59 °F

    Patchy Frost
    and Areas Fog
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Rain, mainly before 11pm. Patchy fog after 2am. Low around 40. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Rain then
    Chance Rain
    and Patchy
    Fog

  • Thursday

    Thursday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Areas Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 64.

    High: 64 °F

    Patchy Fog
    then Partly
    Sunny

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 56. West southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Patchy frost after 5am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 35. West wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.
Tuesday
Areas of frost before 9am. Otherwise, sunny, with a high near 61. Light and variable wind.
Tuesday Night
Patchy fog after 1am. Otherwise, mostly clear, with a low around 36. Light west northwest wind.
Wednesday
Areas of fog before 9am. Patchy frost before 8am. Otherwise, partly sunny, with a high near 59. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Rain, mainly before 11pm. Patchy fog after 2am. Low around 40. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 63.
Thursday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 39.
Friday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 64.
Friday Night
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 43.
Saturday
Patchy fog. Otherwise, partly sunny, with a high near 68.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 73.
Click Map For Forecast
Disclaimer
Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Napa CA
 38.31°N 122.29°W (Elev. 30 ft)
Last Update:
12:26 pm PDT Mar 17, 2025
Forecast Valid:
12pm PDT Mar 17, 2025-6pm PDT Mar 23, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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