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 SW 11 MPH
Barometer 29.62 in (1003.05 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 24 Dec 07:20 AM PST
Extended Forecast for

Sonoma CA

Flood Watch December 24, 07:32am until December 26, 10:00pm
Wind Advisory December 24, 08:00pm until December 25, 10:00am
Click here for hazard details and duration
Flood Watch
Wind Advisory
  •  
    Flood Watch December 24, 07:32am until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Today

    High: 56 °F

    Chance
    Showers and
    Areas Fog
    then Severe
    Thunderstorms

  • Tonight

    Tonight: Showers and thunderstorms before midnight, then showers and possibly a thunderstorm, mainly after midnight. Some of the storms could be severe. Steady temperature around 53. Southeast wind 14 to 21 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 53 °F

    Severe
    Thunderstorms

  • Christmas Day

    Christmas Day: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. Some of the storms could be severe. High near 52. South wind 8 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 52 °F

    Severe
    Thunderstorms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Patchy fog after 4am. Low around 46. South southwest wind 8 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Severe
    Thunderstorms
    then Showers
    and Patchy
    Fog

  • Friday

    Friday: Showers, with thunderstorms also possible after 1pm. Patchy fog before 10am, then patchy fog after 4pm. High near 51. South wind 7 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 51 °F

    Showers and
    Patchy Fog

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 40. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 40 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: A 20 percent chance of showers before 10am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 52.

    High: 52 °F

    Slight Chance
    Showers and
    Areas Fog
    then Patchy
    Fog

  • Saturday Night

    Saturday Night: Patchy fog. Patchy frost after 3am. Otherwise, mostly clear, with a low around 35.

    Low: 35 °F

    Patchy Fog
    then Patchy
    Frost and
    Patchy Fog

Detailed Forecast

Today
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. Some of the storms could be severe. Areas of fog between 8am and 11am. High near 56. Light and variable wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms before midnight, then showers and possibly a thunderstorm, mainly after midnight. Some of the storms could be severe. Steady temperature around 53. Southeast wind 14 to 21 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Christmas Day
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. Some of the storms could be severe. High near 52. South wind 8 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Some of the storms could be severe. Patchy fog after 4am. Low around 46. South southwest wind 8 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Showers, with thunderstorms also possible after 1pm. Patchy fog before 10am, then patchy fog after 4pm. High near 51. South wind 7 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 40. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A 20 percent chance of showers before 10am. Areas of fog before 1pm. Otherwise, partly sunny, with a high near 52.
Saturday Night
Patchy fog. Patchy frost after 3am. Otherwise, mostly clear, with a low around 35.
Sunday
Patchy fog before 9am. Areas of frost before 8am. Otherwise, mostly sunny, with a high near 53.
Sunday Night
Patchy fog after 1am. Patchy frost after 1am. Otherwise, mostly clear, with a low around 34.
Monday
Areas of fog. Areas of frost. Otherwise, sunny, with a high near 54.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 36.
Tuesday
Areas of fog. Otherwise, mostly sunny, with a high near 55.
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ABOUT THIS FORECAST

 
Point Forecast:
Sonoma CA
 38.29°N 122.46°W (Elev. 72 ft)
Last Update:
4:29 am PST Dec 24, 2025
Forecast Valid:
7am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
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Additional Resources

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Chance of Precipitation