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

Strong Atmospheric River Bringing Heavy Rain to the Pacific Northwest; Areas of Snow in the North-Central and Eastern U.S.

A strong atmospheric river will bring prolonged heavy rainfall along with gusty winds to the Pacific Northwest through much of this week. The heavy rainfall may lead to widespread urban and river flooding. Accumulating snow is expected over parts of the central Appalachians and Mid-Atlantic today as well as the Upper Midwest and the Upper Great Lakes this evening into Tuesday. Read More >

Current conditions at

Novato / Gnoss Field (KDVO)

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

Overcast

48°F

9°C

Humidity 81%
Wind Speed SE 6 MPH
Barometer 30.34 in (1027.43 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 08 Dec 01:35 PM PST
Extended Forecast for

Petaluma CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 55. Light south southwest wind.

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Widespread dense fog, mainly between 7pm and 5am. Otherwise, increasing clouds, with a low around 42. Calm wind.

    Low: 42 °F

    Dense Fog

  • Tuesday

    Tuesday: Widespread fog, mainly before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind.

    High: 58 °F

    Fog then
    Sunny

  • Tuesday Night

    Tuesday Night: Widespread fog, mainly after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Fog

  • Wednesday

    Wednesday: Widespread fog, mainly before 7am. Otherwise, mostly sunny, with a high near 65. Calm wind.

    High: 65 °F

    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Widespread fog, mainly after 11pm. Otherwise, mostly clear, with a low around 44.

    Low: 44 °F

    Fog

  • Thursday

    Thursday: Areas of fog before noon. Otherwise, mostly sunny, with a high near 65.

    High: 65 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog. Otherwise, partly cloudy, with a low around 44.

    Low: 44 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 65.

    High: 65 °F

    Patchy Fog
    then Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 55. Light south southwest wind.
Tonight
Widespread dense fog, mainly between 7pm and 5am. Otherwise, increasing clouds, with a low around 42. Calm wind.
Tuesday
Widespread fog, mainly before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind.
Tuesday Night
Widespread fog, mainly after 1am. Otherwise, partly cloudy, with a low around 44. Calm wind.
Wednesday
Widespread fog, mainly before 7am. Otherwise, mostly sunny, with a high near 65. Calm wind.
Wednesday Night
Widespread fog, mainly after 11pm. Otherwise, mostly clear, with a low around 44.
Thursday
Areas of fog before noon. Otherwise, mostly sunny, with a high near 65.
Thursday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Friday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 65.
Friday Night
Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 42.
Saturday
Areas of fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 44.
Sunday
Areas of fog. Otherwise, partly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Petaluma CA
 38.23°N 122.65°W (Elev. 98 ft)
Last Update:
12:26 pm PST Dec 8, 2025
Forecast Valid:
2pm PST Dec 8, 2025-6pm PST Dec 14, 2025
 
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Additional Resources

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Chance of Precipitation