Penngrove, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penngrove, a community in Sonoma County, California.
Tonight
43°F
Mostly Cloudy then Patchy Fog
Patchy fog after 1am. Mostly cloudy. Low around 43, with temperatures rising to around 45 overnight. East wind 1 to 6 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Penngrove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Mostly Cloudy then Patchy Fog | 1 to 6 mph E | 13% |
| Wednesday | 68°F | Patchy Fog then Sunny | 1 to 9 mph NW | 2% |
| Wednesday Night | 43°F | Mostly Cloudy then Patchy Fog | 2 to 6 mph NW | 2% |
| Thursday | 72°F | Patchy Fog then Mostly Sunny | 3 mph NW | 0% |
| Thursday Night | 41°F | Patchy Fog | 2 mph NNW | 0% |
| Friday | 73°F | Patchy Fog then Mostly Sunny | 2 mph W | 0% |
| Friday Night | 43°F | Mostly Clear | 2 mph NW | 0% |
| Saturday | 74°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Saturday Night | 43°F | Areas Of Fog | 2 mph NW | 0% |
| Sunday | 74°F | Areas Of Fog then Mostly Sunny | 2 mph WNW | 0% |
| Sunday Night | 45°F | Areas Of Fog | 2 mph NW | 0% |
| Monday | 72°F | Areas Of Fog then Partly Sunny | 0 to 3 mph WNW | 2% |
| Monday Night | 44°F | Areas Of Fog | 0 to 3 mph NW | 2% |
| Tuesday | 72°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph NW | 9% |
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 Nov 4, 2026.