Petaluma, CA Weather & Growing Conditions
Overnight
44°F
Chance Light Rain
A chance of rain and patchy fog. Partly cloudy, with a low around 44. East southeast wind around 2 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Chance Light Rain | 2 mph ESE | 25% |
| Wednesday | 66°F | Patchy Fog then Sunny | 1 to 9 mph NW | 2% |
| Wednesday Night | 43°F | Mostly Cloudy | 2 to 9 mph NW | 2% |
| Thursday | 71°F | Patchy Fog then Mostly Sunny | 3 mph W | 0% |
| Thursday Night | 41°F | Patchy Fog | 3 mph NW | 0% |
| Friday | 72°F | Patchy Fog then Mostly Sunny | 2 mph NNW | 0% |
| Friday Night | 44°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 73°F | Sunny | 2 mph ENE | 0% |
| Saturday Night | 44°F | Partly Cloudy then Patchy Fog | 3 mph NW | 0% |
| Sunday | 73°F | Patchy Fog then Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 46°F | Patchy Fog | 2 mph WNW | 0% |
| Monday | 71°F | Patchy Fog then Partly Sunny | 3 mph WNW | 2% |
| Monday Night | 45°F | Partly Cloudy then Patchy Fog | 3 mph WNW | 2% |
| Tuesday | 71°F | Areas Of Fog then Mostly Sunny | 3 mph NW | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Petaluma, CA
Last spring frost
Feb 28
First fall frost
Nov 25
Growing season
271 days
Hardiness zone
9b
Explore more for Petaluma, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Petaluma Ap, Ca (3.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.