Penngrove, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penngrove, a community in Sonoma County, California.
Today
90°F
Patchy Fog then Sunny
Patchy fog between 8am and 9am. Sunny. High near 90, with temperatures falling to around 83 in the afternoon. West wind 0 to 8 mph.
7-day forecast for Penngrove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Patchy Fog then Sunny | 0 to 8 mph W | 0% |
| Tonight | 51°F | Areas Of Fog | 0 to 5 mph WNW | 0% |
| Wednesday | 86°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph W | 0% |
| Wednesday Night | 51°F | Areas Of Fog | 0 to 6 mph WSW | 0% |
| Thursday | 83°F | Areas Of Fog then Mostly Sunny | 0 to 7 mph W | 0% |
| Thursday Night | 51°F | Patchy Fog | 0 to 7 mph WSW | 0% |
| Friday | 89°F | Patchy Fog then Mostly Sunny | 0 to 7 mph W | 0% |
| Friday Night | 52°F | Partly Cloudy | 0 to 7 mph W | 0% |
| Saturday | 89°F | Patchy Fog then Sunny | 0 to 7 mph W | 0% |
| Saturday Night | 55°F | Mostly Clear | 0 to 7 mph SW | 0% |
| Sunday | 86°F | Patchy Fog then Sunny | 0 to 8 mph WSW | 0% |
| Sunday Night | 52°F | Mostly Clear then Areas Of Fog | 0 to 8 mph SW | 0% |
| Monday | 80°F | Areas Of Fog then Sunny | 0 to 7 mph SSW | 0% |
| Monday Night | 51°F | Partly Cloudy | 0 to 7 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 Aug 4, 2026.