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

Novato / Gnoss Field (KDVO)

Lat: 38.14178°NLon: 122.55463°WElev: 3.0ft.

Mostly Cloudy

59°F

15°C

Humidity 62%
Wind Speed SSW 19 MPH
Barometer 29.77 in (1008.13 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 25 Dec 08:55 AM PST
Extended Forecast for

Novato/Gnoss Field Airport CA

Flood Watch December 25, 09:15am until December 26, 10:00pm
Wind Advisory December 25, 09:15am until December 25, 10:00am
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch December 25, 09:15am until December 26, 10:00pm
    Wind Advisory December 25, 09:15am until December 25, 10:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Christmas Day

    High: 57 °F⇓

    Severe
    Thunderstorms

  • 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. South wind 13 to 18 mph becoming west southwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Severe
    Thunderstorms
    then Rain
    Likely

  • Friday

    Friday: Rain, mainly before 4pm. High near 55. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 44. West northwest wind around 7 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Chance Rain
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain. Mostly sunny, with a high near 54. North wind around 6 mph.

    High: 54 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 54.

    High: 54 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 4am. Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

Detailed Forecast

Christmas Day
Rain before 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. Temperature rising to near 57 by 11am, then falling to around 52 during the remainder of the day. South southwest wind 16 to 20 mph, with gusts as high as 34 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. South wind 13 to 18 mph becoming west southwest after midnight. Winds could gust as high as 34 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 55. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 44. West northwest wind around 7 mph. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of rain. Mostly sunny, with a high near 54. North wind around 6 mph.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 54.
Sunday Night
Patchy frost after 4am. Otherwise, mostly clear, with a low around 36.
Monday
Patchy frost before 7am. Otherwise, sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Mostly cloudy, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Novato/Gnoss Field Airport CA
 38.13°N 122.56°W (Elev. 36 ft)
Last Update:
8:59 am PST Dec 25, 2025
Forecast Valid:
9am 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

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation