Guerneville, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Guerneville, a community in Sonoma County, California.
Overnight
46°F
Mostly Clear
Mostly clear, with a low around 46. North wind around 1 mph.
7-day forecast for Guerneville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Clear | 1 mph N | 0% |
| Wednesday | 68°F | Patchy Fog then Sunny | 1 to 8 mph NW | 2% |
| Wednesday Night | 48°F | Mostly Cloudy | 2 to 7 mph NW | 2% |
| Thursday | 74°F | Sunny | 2 mph NW | 0% |
| Thursday Night | 46°F | Mostly Clear | 2 mph NW | 0% |
| Friday | 75°F | Sunny | 2 mph NW | 0% |
| Friday Night | 48°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 75°F | Sunny | 2 mph SW | 0% |
| Saturday Night | 48°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 75°F | Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 49°F | Partly Cloudy | 2 mph NW | 0% |
| Monday | 72°F | Mostly Sunny | 3 mph WNW | 2% |
| Monday Night | 49°F | Partly Cloudy | 3 mph NW | 3% |
| Tuesday | 72°F | Slight Chance Light Rain | 3 mph NW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Guerneville (38.517, -122.990). Updated through the day.
Growing snapshot for Guerneville
Last spring frost
Jan 29
First fall frost
Dec 30
Growing season
347 days
Hardiness zone
9b
More local growing data for Guerneville: nearby ZIP 95446 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Occidental, Ca (9.5 mi from Guerneville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.