Guerneville, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Guerneville, a community in Sonoma County, California.

This Afternoon

82°F

Sunny

Sunny. High near 82, with temperatures falling to around 79 in the afternoon. West wind around 7 mph.

7-day forecast for Guerneville

When	Temp	Forecast	Wind	Precip
This Afternoon	82°F	Sunny	7 mph W	0%
Tonight	53°F	Mostly Clear	0 to 6 mph WNW	0%
Saturday	85°F	Patchy Fog then Sunny	0 to 6 mph SSW	0%
Saturday Night	54°F	Mostly Cloudy	0 to 3 mph NW	0%
Sunday	80°F	Patchy Fog then Partly Sunny	0 to 5 mph WSW	0%
Sunday Night	52°F	Areas Of Fog	0 to 5 mph SW	0%
Monday	81°F	Areas Of Fog then Mostly Sunny	0 to 5 mph SW	0%
Monday Night	53°F	Areas Of Fog	0 to 5 mph SW	0%
Tuesday	84°F	Areas Of Fog then Sunny	0 to 5 mph WSW	0%
Tuesday Night	54°F	Mostly Clear	0 to 5 mph NW	0%
Wednesday	90°F	Sunny	0 to 5 mph WSW	0%
Wednesday Night	58°F	Mostly Clear	0 to 5 mph WNW	0%
Thursday	91°F	Sunny	0 to 6 mph SW	0%
Thursday Night	58°F	Partly Cloudy	0 to 6 mph WNW	0%

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

More local growing data for Guerneville: nearby ZIP 95446 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Bloomfield Bodega Bodega Bay Boyes Hot Springs Calistoga Carmet Cazadero Cloverdale Cotati El Verano Eldridge Fetters Hot Springs-Agua Caliente Forestville Fulton Geyserville Glen Ellen Graton Healdsburg Jenner Kenwood Larkfield-Wikiup Monte Rio Occidental Penngrove Petaluma Rohnert Park Salmon Creek Santa Rosa Sea Ranch Sebastopol

All California locations ›

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 Sep 19, 2026.