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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

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

Partly Cloudy

59°F

15°C

Humidity 67%
Wind Speed S 17 MPH
Barometer 29.82 in (1009.82 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 25 Dec 10:20 AM PST
Extended Forecast for

Napa Co. Airport CA

Flood Watch December 25, 10:43am until December 26, 10:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 25, 10:43am until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Christmas Day

    High: 54 °F

    Severe
    Thunderstorms
    and Breezy

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Steady temperature around 51. Breezy, with a south wind 15 to 23 mph becoming west after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Severe
    Thunderstorms
    and Breezy
    then Rain
    Likely

  • Friday

    Friday: Rain, mainly before 4pm. High near 52. South wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 41. West southwest wind 7 to 9 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 41 °F

    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 10am. Mostly sunny, with a high near 50. North wind 6 to 9 mph.

    High: 50 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 4am. Otherwise, mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 7am. Otherwise, mostly sunny, with a high near 51.

    High: 51 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 1am. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear
    then Patchy
    Frost

Detailed Forecast

Christmas Day
Showers and possibly a thunderstorm. Some of the storms could be severe. High near 54. Breezy, with a south southwest wind 22 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Steady temperature around 51. Breezy, with a south wind 15 to 23 mph becoming west after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 52. South wind around 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 41. West southwest wind 7 to 9 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of rain before 10am. Mostly sunny, with a high near 50. North wind 6 to 9 mph.
Saturday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 37.
Sunday
Patchy frost before 7am. Otherwise, mostly sunny, with a high near 51.
Sunday Night
Patchy frost after 1am. Otherwise, mostly clear, with a low around 34.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 52.
Monday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 35.
Tuesday
Patchy frost. Otherwise, sunny, with a high near 53.
Tuesday Night
Mostly clear, with a low around 37.
Wednesday
Partly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Napa Co. Airport CA
 38.2°N 122.29°W (Elev. 20 ft)
Last Update:
8:59 am PST Dec 25, 2025
Forecast Valid:
10am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
Forecast Discussion
 
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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