Guerneville, CA Weather & Growing Conditions
Today
95°F
Sunny
Sunny. High near 95, with temperatures falling to around 90 in the afternoon. South wind 0 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 95°F | Sunny | 0 to 6 mph S | 0% |
| Tonight | 53°F | Partly Cloudy then Patchy Fog | 2 mph SW | 0% |
| Wednesday | 89°F | Patchy Fog then Mostly Sunny | 0 to 6 mph S | 0% |
| Wednesday Night | 52°F | Areas Of Fog | 0 to 3 mph SSW | 0% |
| Thursday | 86°F | Patchy Fog then Sunny | 0 to 5 mph SSW | 0% |
| Thursday Night | 54°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Friday | 96°F | Sunny | 0 to 5 mph SW | 0% |
| Friday Night | 57°F | Mostly Clear | 0 to 5 mph W | 0% |
| Saturday | 96°F | Sunny | 0 to 5 mph WSW | 0% |
| Saturday Night | 61°F | Mostly Clear | 3 mph WNW | 0% |
| Sunday | 96°F | Sunny | 1 to 6 mph WSW | 0% |
| Sunday Night | 56°F | Mostly Clear | 0 to 5 mph WNW | 0% |
| Monday | 85°F | Sunny | 0 to 6 mph SSW | 0% |
| Monday Night | 54°F | Mostly Clear | 0 to 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Guerneville, CA
Last spring frost
Feb 15
First fall frost
Dec 2
Growing season
292 days
Hardiness zone
9b
Explore more for Guerneville, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Healdsburg, Ca (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.