Penngrove, CA Weather & Growing Conditions
Tonight
46°F
Chance Light Rain then Patchy Fog
A chance of rain before 10pm, then patchy fog. Mostly cloudy, with a low around 46. East northeast wind 1 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Chance Light Rain then Patchy Fog | 1 to 5 mph ENE | 35% |
| Wednesday | 66°F | Patchy Fog then Sunny | 1 to 7 mph NNW | 1% |
| Wednesday Night | 46°F | Mostly Cloudy | 5 mph NW | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 2 mph NW | 0% |
| Thursday Night | 46°F | Mostly Clear | 2 mph NNW | 0% |
| Friday | 72°F | Sunny | 2 mph WNW | 0% |
| Friday Night | 47°F | Mostly Clear | 1 mph NW | 0% |
| Saturday | 74°F | Sunny | 2 mph E | 0% |
| Saturday Night | 48°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 73°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 48°F | Mostly Cloudy | 1 mph NW | 0% |
| Monday | 71°F | Partly Sunny | 0 to 3 mph NW | 3% |
| Monday Night | 48°F | Mostly Cloudy | 2 mph W | 3% |
| Tuesday | 71°F | Mostly Sunny | 2 mph NW | 13% |
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 Nov 4, 2026.