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Petaluma, CA Weather

It is 46°F and clear in Petaluma, CA, observed at 4:35 AM PDT. Today: Areas Of Fog then Partly Sunny, high 64°F, low 43°F. Hourly and 10-day forecast from the National Weather Service. Times are local (PDT).

Petaluma, CA current weather

46°F

Clear

H 64° / L 43°Feels like 46°

Observed at Novato / Gnoss Field (8 mi away), 10/31/2026, 4:35 AM PDT

1 active alert

From the National Weather Service for this forecast zone or county

State alerts

Minor1Minimal to no known threat

Hourly forecast

NWS, updated 10/31/2026, 1:26 AM PT

  1. Now44°
  2. 6 AM43°
  3. 7 AM43°
  4. 8 AM43°
  5. 9 AM46°
  6. 10 AM51°
  7. 11 AM58°
  8. 12 PM61°
  9. 1 PM63°
  10. 2 PM64°
  11. 3 PM64°
  12. 4 PM63°
  13. 5 PM61°
  14. 6 PM57°
  15. 7 PM55°
  16. 8 PM53°20%
  17. 9 PM52°18%
  18. 10 PM50°26%
  19. 11 PM50°29%
  20. 12 AM49°43%Sun
  21. 1 AM48°39%
  22. 1 AM47°18%
  23. 2 AM45°10%
  24. 3 AM45°
  25. 4 AM44°
  26. 5 AM42°
  27. 6 AM42°
  28. 7 AM42°
  29. 8 AM46°
  30. 9 AM51°
  31. 10 AM56°
  32. 11 AM61°
  33. 12 PM64°
  34. 1 PM65°
  35. 2 PM66°
  36. 3 PM65°
  37. 4 PM63°
  38. 5 PM61°
  39. 6 PM57°
  40. 7 PM54°
  41. 8 PM51°
  42. 9 PM50°
  43. 10 PM49°
  44. 11 PM47°
  45. 12 AM45°Mon
  46. 1 AM44°
  47. 2 AM43°
  48. 3 AM42°

10-day forecast

Tap a day for details

  • Today10/31Low 43°High 64°

    Saturday: Areas of fog before 11am. Partly sunny. High near 64, with temperatures falling to around 61 in the afternoon. West northwest wind 0 to 7 mph.

    Overnight: Areas of fog. Mostly cloudy, with a low around 43. Wind around 0 mph.

    Areas Of Fog then Partly Sunny
  • Sun11/1Low 39°High 66°

    Sunday: Patchy fog before 10am. Mostly sunny, with a high near 66. West northwest wind around 3 mph.

    Sunday Night: Areas of fog after 11pm. Mostly clear, with a low around 39. Northwest wind around 3 mph.

    Patchy Fog then Mostly Sunny
  • Mon11/226% chance of precipitationLow 43°High 68°

    Monday: Areas of fog before 8am. Partly sunny, with a high near 68.

    Monday Night: Patchy fog between 3am and 4am, then a chance of rain showers and patchy fog. Mostly cloudy, with a low around 43.

    Areas Of Fog then Partly Sunny
  • Tue11/343% chance of precipitationLow 43°High 66°

    Tuesday: A chance of rain showers and patchy fog before 4pm, then a chance of rain. Mostly cloudy, with a high near 66.

    Tuesday Night: A chance of rain before 9pm, then a chance of rain and patchy fog between 9pm and 10pm, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 43.

    Chance Rain Showers then Chance Light Rain
  • Wed11/418% chance of precipitationLow 44°High 67°

    Wednesday: Patchy fog and a slight chance of rain. Partly sunny, with a high near 67.

    Wednesday Night: A slight chance of rain before 9pm, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 44.

    Patchy Fog
  • Thu11/512% chance of precipitationLow 42°High 68°

    Thursday: Patchy fog before 9am. Partly sunny, with a high near 68.

    Thursday Night: Patchy fog after 1am. Mostly cloudy, with a low around 42.

    Patchy Fog then Partly Sunny
  • Fri11/612% chance of precipitationLow High 70°

    Friday: Patchy fog before 9am. Mostly sunny, with a high near 70.

    Patchy Fog then Mostly Sunny
  • Sat11/7Model blendLow 44°High 75°

    Saturday: Mostly sunny. High near 75°. Low that night near 44°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sun11/8Model blendLow 44°High 73°

    Sunday: Partly cloudy. High near 73°. Low that night near 44°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Mon11/9Model blend18% chance of precipitationLow 43°High 69°

    Monday: Mostly cloudy. High near 69°. Low that night near 43°. About 0.04 in of precipitation.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 38.244, -122.623 from the NWS MTR office, updated 10/31/2026, 1:26 AM PT · Official forecast on weather.gov

Days 8 to 10: NOAA National Blend of Models, station KO69 (Petaluma Muni, 1 mi), model run 10/31/2026, 1:00 AM PDT

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now44°Areas Of Fog1%0 mph
  2. 6 AM43°Areas Of Fog1%0 mph
  3. 7 AM43°Areas Of Fog1%0 mph
  4. 8 AM43°Areas Of Fog1%0 mph
  5. 9 AM46°Areas Of Fog1%0 mph
  6. 10 AM51°Patchy Fog1%1 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the weather in Petaluma, CA right now?
The latest observation from Novato / Gnoss Field was 46°F and clear, reported at 10/31/2026, 4:35 AM PDT.
What is the high temperature today in Petaluma, CA?
The National Weather Service forecast for saturday calls for a high near 64°F. Areas Of Fog then Partly Sunny.
Will it rain in Petaluma, CA in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What is the 10-day forecast for Petaluma, CA?
The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 7 to Nov 9) come from the NOAA National Blend of Models, with highs of 69°F to 75°F. Model guidance this far out often changes.
What time is sunrise and sunset in Petaluma, CA today?
Sunrise is about 7:35 AM PDT and sunset is about 6:12 PM PDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Petaluma, CA?
At Petaluma AP, the 1991 to 2020 normal high in October is 76°F and the normal low is 48°F.

Rain and snow totals

Next 3 days, NWS forecast grid

Rain (liquid)
0.02 in
Snow
0.00 in
Ice
0.00 in

Nearby hazards

California hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

UV and air quality forecast

EPA and AirNow

AQI forecast today (Santa Rosa)
44GoodPM2.5
AQI forecast tomorrow (Santa Rosa)
33GoodPM2.5

UV index guide · Air quality

Drought

By county

Sonoma County, week of 10/27/2026

No drought or abnormal dryness in this county.

Tides nearby

NOAA tide stations

Sun and moon

Local time, center of the area

Sunrise
7:35 AM
Sunset
6:12 PM
Daylight
10 hr 36 min
Moon
Waning Gibbous 71% lit
First light (civil dawn)
7:08 AM
Last light (civil dusk)
6:39 PM
Moonrise
11:20 PM
Moonset
1:40 PM

Normal October weather

Climate

Normal October high 76°, low 48°, precipitation 1.27 in for the month. 1991 to 2020 normals at Petaluma AP, 1 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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