Petaluma, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petaluma, a city in Sonoma County, California.
This Afternoon
84°F
Sunny
Sunny. High near 84, with temperatures falling to around 76 in the afternoon. West wind 1 to 9 mph.
7-day forecast for Petaluma
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Sunny | 1 to 9 mph W | 0% |
| Tonight | 52°F | Mostly Cloudy then Areas Of Fog | 0 to 7 mph WNW | 0% |
| Sunday | 77°F | Areas Of Fog then Mostly Cloudy | 0 to 6 mph SW | 0% |
| Sunday Night | 52°F | Areas Of Fog | 0 to 5 mph WSW | 0% |
| Monday | 79°F | Areas Of Fog then Mostly Sunny | 0 to 8 mph WSW | 0% |
| Monday Night | 52°F | Areas Of Fog | 0 to 8 mph WNW | 1% |
| Tuesday | 80°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph WSW | 0% |
| Tuesday Night | 52°F | Areas Of Fog | 0 to 7 mph W | 0% |
| Wednesday | 88°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph WNW | 0% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 7 mph NW | 0% |
| Thursday | 90°F | Mostly Sunny | 0 to 7 mph W | 0% |
| Thursday Night | 56°F | Partly Cloudy | 1 to 7 mph W | 0% |
| Friday | 84°F | Mostly Sunny | 1 to 8 mph WSW | 0% |
| Friday Night | 53°F | Partly Cloudy | 1 to 8 mph WSW | 1% |
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
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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 Sep 19, 2026.