Penngrove, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penngrove, a community in Sonoma County, California.
Tonight
52°F
Areas Of Fog
Areas of fog after 10pm. Partly cloudy, with a low around 52. West southwest wind 0 to 7 mph.
7-day forecast for Penngrove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Areas Of Fog | 0 to 7 mph WSW | 0% |
| Saturday | 83°F | Areas Of Fog then Mostly Sunny | 0 to 8 mph WSW | 0% |
| Saturday Night | 52°F | Areas Of Fog | 0 to 5 mph SW | 0% |
| Sunday | 77°F | Areas Of Fog then Partly Sunny | 0 to 6 mph SW | 0% |
| Sunday Night | 52°F | Areas Of Fog | 0 to 6 mph SW | 0% |
| Monday | 79°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph W | 0% |
| Monday Night | 52°F | Areas Of Fog | 0 to 7 mph W | 0% |
| Tuesday | 82°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph W | 0% |
| Tuesday Night | 52°F | Partly Cloudy then Areas Of Fog | 0 to 7 mph NW | 0% |
| Wednesday | 90°F | Areas Of Fog then Mostly Sunny | 0 to 6 mph W | 0% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 6 mph WNW | 0% |
| Thursday | 90°F | Mostly Sunny | 0 to 7 mph WSW | 0% |
| Thursday Night | 56°F | Partly Cloudy | 0 to 7 mph W | 0% |
| Friday | 84°F | Mostly Sunny | 0 to 8 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Penngrove (38.301, -122.671). Updated through the day.
Growing snapshot for Penngrove
Last spring frost
Feb 28
First fall frost
Nov 25
Growing season
271 days
Hardiness zone
9b
More local growing data for Penngrove: nearby ZIP 94951 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Petaluma Ap, Ca (4.9 mi from Penngrove). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.