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

KF6YUA Sebastopol (AR323)

Lat: 38.3803°NLon: 122.8242°WElev: 230.0ft.

NA

52°F

11°C

Humidity 98%
Wind Speed SSW 3 MPH
Barometer 29.6 in (1002.37 mb)
Dewpoint 51°F (11°C)
Visibility NA
Last update 25 Dec 02:11 AM PST
Extended Forecast for

Graton CA

Flood Watch December 25, 02:16am until December 26, 10:00pm
Wind Advisory December 25, 02:16am until December 25, 10:00am
Click here for hazard details and duration
Flood Watch
Wind Advisory
  •  
    Flood Watch December 25, 02:16am until December 26, 10:00pm
    Wind Advisory December 25, 02:16am until December 25, 10:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 49 °F

    Severe
    Thunderstorms
    and Breezy

  • 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 52. South wind 14 to 21 mph, with gusts as high as 37 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 before 1am, then rain after 1am. Some of the storms could be severe. Low around 46. South wind 9 to 16 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Severe
    Thunderstorms

  • Friday

    Friday: Rain, mainly before 4pm. High near 53. South wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 53 °F

    Rain

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 41. North northwest wind 3 to 5 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 53.

    High: 53 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 10pm. Patchy frost after 3am. Otherwise, partly cloudy, with a low around 37.

    Low: 37 °F

    Patchy Fog
    then Patchy
    Frost and
    Patchy Fog

  • Sunday

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

    High: 54 °F

    Patchy Frost
    and Patchy
    Fog then
    Mostly Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Breezy, with a south wind 17 to 23 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter 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 52. South wind 14 to 21 mph, with gusts as high as 37 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 before 1am, then rain after 1am. Some of the storms could be severe. Low around 46. South wind 9 to 16 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Rain, mainly before 4pm. High near 53. 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. North northwest wind 3 to 5 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 53.
Saturday Night
Patchy fog after 10pm. Patchy frost after 3am. Otherwise, partly cloudy, with a low around 37.
Sunday
Patchy fog before 7am. Patchy frost before 7am. Otherwise, mostly sunny, with a high near 54.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36.
Monday
Patchy fog between 7am and 8am. Areas of frost before 8am. Otherwise, sunny, with a high near 56.
Monday Night
Patchy frost. Otherwise, mostly clear, with a low around 36.
Tuesday
Patchy fog. Patchy frost. Otherwise, sunny, with a high near 58.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 39.
Wednesday
Patchy fog. Otherwise, partly sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Graton CA
 38.45°N 122.88°W (Elev. 95 ft)
Last Update:
12:27 am PST Dec 25, 2025
Forecast Valid:
2am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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Chance of Precipitation