Guerneville, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Guerneville, a community in Sonoma County, California.
Today
93°F
Sunny
Sunny. High near 93, with temperatures falling to around 87 in the afternoon. South southwest wind 0 to 7 mph.
7-day forecast for Guerneville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 93°F | Sunny | 0 to 7 mph SSW | 0% |
| Tonight | 53°F | Areas Of Fog | 0 to 3 mph WSW | 1% |
| Wednesday | 87°F | Areas Of Fog then Mostly Sunny | 0 to 6 mph SSW | 0% |
| Wednesday Night | 52°F | Areas Of Fog | 0 to 5 mph WNW | 0% |
| Thursday | 84°F | Areas Of Fog then Sunny | 0 to 6 mph SW | 0% |
| Thursday Night | 53°F | Mostly Clear | 0 to 5 mph W | 0% |
| Friday | 93°F | Sunny | 0 to 6 mph SW | 0% |
| Friday Night | 56°F | Mostly Clear | 0 to 5 mph W | 0% |
| Saturday | 94°F | Sunny | 0 to 6 mph WSW | 0% |
| Saturday Night | 59°F | Mostly Clear | 1 to 5 mph WNW | 0% |
| Sunday | 94°F | Sunny | 0 to 6 mph WSW | 0% |
| Sunday Night | 55°F | Mostly Clear | 0 to 6 mph WNW | 0% |
| Monday | 84°F | Sunny | 0 to 6 mph SSW | 0% |
| Monday Night | 53°F | Mostly Clear | 0 to 6 mph W | 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
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 Aug 4, 2026.