Harman US

Guerneville, CA Weather & Growing Conditions

Today
84°F
Sunny
Sunny. High near 84, with temperatures falling to around 81 in the afternoon. South southwest wind 0 to 7 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 84°F Sunny 0 to 7 mph SSW 0%
Tonight 53°F Partly Cloudy 0 to 5 mph W 0%
Sunday 78°F Patchy Fog then Partly Sunny 0 to 6 mph SW 0%
Sunday Night 52°F Mostly Cloudy then Areas Of Fog 0 to 3 mph W 0%
Monday 79°F Areas Of Fog then Mostly Sunny 0 to 6 mph SW 0%
Monday Night 52°F Areas Of Fog 0 to 5 mph WNW 0%
Tuesday 80°F Areas Of Fog then Sunny 0 to 5 mph WSW 0%
Tuesday Night 53°F Mostly Clear 0 to 5 mph NW 0%
Wednesday 87°F Patchy Fog then Sunny 0 to 5 mph W 0%
Wednesday Night 58°F Mostly Clear 0 to 5 mph NW 0%
Thursday 88°F Sunny 0 to 5 mph W 0%
Thursday Night 57°F Partly Cloudy 0 to 5 mph WNW 0%
Friday 82°F Mostly Sunny 0 to 6 mph WNW 1%
Friday Night 54°F Partly Cloudy 0 to 6 mph WNW 3%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Guerneville, CA

Last spring frost
Jan 29
First fall frost
Dec 30
Growing season
347 days
Hardiness zone
9b

Explore more for Guerneville, CA: full frost dates · planting calendar · California frost dates

Climate data from the nearest NOAA station, Occidental, Ca (9.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.