Penngrove, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penngrove, a community in Sonoma County, California.
This Afternoon
62°F
Light Rain Likely
Rain likely. Mostly cloudy. High near 62, with temperatures falling to around 56 in the afternoon. East southeast wind around 3 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Penngrove
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Light Rain Likely | 3 mph ESE | 56% |
| Tonight | 43°F | Chance Light Rain then Patchy Fog | 1 to 6 mph ENE | 41% |
| Wednesday | 68°F | Areas Of Fog then Mostly Sunny | 1 to 9 mph NW | 1% |
| Wednesday Night | 43°F | Mostly Cloudy then Patchy Fog | 2 to 7 mph NW | 0% |
| Thursday | 72°F | Patchy Fog then Sunny | 1 to 5 mph NW | 0% |
| Thursday Night | 42°F | Areas Of Fog | 0 to 5 mph NW | 0% |
| Friday | 73°F | Areas Of Fog then Mostly Sunny | 2 mph WNW | 0% |
| Friday Night | 44°F | Mostly Clear then Patchy Fog | 2 mph NW | 0% |
| Saturday | 75°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Saturday Night | 45°F | Areas Of Fog | 2 mph WNW | 0% |
| Sunday | 74°F | Patchy Fog then Mostly Sunny | 0 to 3 mph NW | 0% |
| Sunday Night | 46°F | Areas Of Fog | 0 to 3 mph NW | 0% |
| Monday | 72°F | Areas Of Fog then Partly Sunny | 1 to 5 mph WNW | 3% |
| Monday Night | 45°F | Areas Of Fog | 0 to 5 mph WNW | 3% |
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.