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.

Overcast

55°F

13°C

Humidity 87%
Wind Speed S 14 MPH
Barometer 29.63 in (1003.39 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 25 Dec 04:20 AM PST
Extended Forecast for

Yountville CA

Flood Watch December 25, 04:39am until December 26, 10:00pm
Wind Advisory December 25, 04:39am until December 25, 10:00am
Flood Advisory until December 25, 06:15am
Click here for hazard details and duration
Flood Watch
Wind Advisory
Flood Advisory
  •  
    Flood Watch December 25, 04:39am until December 26, 10:00pm
    Wind Advisory December 25, 04:39am until December 25, 10:00am
    Flood Advisory until December 25, 06:15am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 51 °F

    Severe
    Thunderstorms

  • Christmas Day

    Christmas Day: Showers and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 51. South wind 13 to 17 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 51 °F

    Severe
    Thunderstorms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 45. South wind 9 to 13 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Severe
    Thunderstorms
    then Rain
    Likely

  • Friday

    Friday: Rain, mainly before 4pm. High near 50. South wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 50 °F

    Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 41. Light and variable wind. 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.

    High: 50 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 51. South wind around 16 mph, with gusts as high as 32 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Christmas Day
Showers and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 51. South wind 13 to 17 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Low around 45. South wind 9 to 13 mph, with gusts as high as 32 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 50. South wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 41. Light and variable wind. 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.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 37.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 53.
Monday Night
Patchy fog. Patchy frost. Otherwise, mostly clear, with a low around 36.
Tuesday
Patchy frost. Otherwise, sunny, with a high near 54.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 38.
Wednesday
Patchy fog. Otherwise, partly sunny, with a high near 55.
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ABOUT THIS FORECAST

 
Point Forecast:
Yountville CA
 38.39°N 122.37°W (Elev. 558 ft)
Last Update:
12:27 am PST Dec 25, 2025
Forecast Valid:
4am 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