Penngrove, CA Weather & Growing Conditions
Tonight
52°F
Partly Cloudy then Areas Of Fog
Areas of fog after midnight. Partly cloudy, with a low around 52. Southwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Partly Cloudy then Areas Of Fog | 1 mph SW | 0% |
| Saturday | 83°F | Areas Of Fog then Sunny | 0 to 6 mph SW | 0% |
| Saturday Night | 53°F | Mostly Cloudy then Patchy Fog | 0 to 3 mph SW | 0% |
| Sunday | 77°F | Areas Of Fog then Partly Sunny | 0 to 5 mph SW | 0% |
| Sunday Night | 52°F | Areas Of Fog | 0 to 5 mph SW | 0% |
| Monday | 79°F | Areas Of Fog then Mostly Sunny | 0 to 5 mph WSW | 0% |
| Monday Night | 52°F | Areas Of Fog | 0 to 5 mph WSW | 0% |
| Tuesday | 82°F | Areas Of Fog then Sunny | 0 to 5 mph WSW | 0% |
| Tuesday Night | 53°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Wednesday | 89°F | Areas Of Fog then Sunny | 0 to 5 mph WSW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Thursday | 89°F | Mostly Sunny | 0 to 5 mph WSW | 0% |
| Thursday Night | 57°F | Partly Cloudy | 0 to 5 mph WSW | 0% |
| Friday | 84°F | Mostly Sunny | 0 to 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Penngrove, CA
Last spring frost
Feb 28
First fall frost
Nov 25
Growing season
271 days
Hardiness zone
9b
Explore more for Penngrove, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Petaluma Ap, Ca (4.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.