Petaluma, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petaluma, a city in Sonoma County, California.
Tonight
44°F
Mostly Cloudy then Areas Of Fog
Areas of fog after 1am. Mostly cloudy. Low around 44, with temperatures rising to around 46 overnight. East southeast wind 1 to 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Petaluma
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Mostly Cloudy then Areas Of Fog | 1 to 5 mph ESE | 9% |
| Wednesday | 68°F | Areas Of Fog then Sunny | 0 to 8 mph NW | 2% |
| Wednesday Night | 43°F | Mostly Cloudy then Patchy Fog | 2 to 7 mph WNW | 2% |
| Thursday | 73°F | Patchy Fog then Mostly Sunny | 3 mph WNW | 0% |
| Thursday Night | 41°F | Areas Of Fog | 0 to 3 mph NNW | 0% |
| Friday | 74°F | Areas Of Fog then Mostly Sunny | 2 mph W | 0% |
| Friday Night | 43°F | Mostly Clear then Patchy Fog | 2 mph NW | 0% |
| Saturday | 75°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Saturday Night | 43°F | Patchy Fog | 2 mph NW | 0% |
| Sunday | 74°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph NW | 0% |
| Sunday Night | 45°F | Areas Of Fog | 0 to 3 mph NW | 0% |
| Monday | 72°F | Areas Of Fog then Partly Sunny | 1 to 5 mph WNW | 2% |
| Monday Night | 44°F | Areas Of Fog | 1 to 5 mph WNW | 2% |
| Tuesday | 72°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph WNW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Petaluma (38.242, -122.629). Updated through the day.
Growing snapshot for Petaluma
Last spring frost
Feb 28
First fall frost
Nov 25
Growing season
271 days
Hardiness zone
9b
More local growing data for Petaluma: nearby ZIP 94954 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
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Forestville
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Climate data from the nearest NOAA station, Petaluma Ap, Ca (3.2 mi from Petaluma). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.