Guerneville (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Guerneville.
Climate overview of Guerneville
Temperatures in Guerneville, California, United States of America, vary greatly throughout the year. July is the hottest month at 28°C (82°F), while December is the coldest at 14°C (57°F).
The city receives considerable rainfall, with around 1082 mm (43 in) annually. December is the wettest month. It has distinct dry (May to September) and wet (December to February) seasons, with warm summers and mild winters. Sunshine peaks in May, when the city sees around 10.3 hours of sunshine per day.
Guerneville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Guerneville - and find the best time to visit.
Monthly Temperature in Guerneville
The climate in Guerneville is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in July to a moderate 14°C (57°F) in the coolest month, December.
Nights vary from 11°C (52°F) in July to around 3°C (37°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Guerneville
Guerneville has a notably wet climate with abundant precipitation, recording 1082 mm (43 in) of rainfall per year. The climate in Guerneville shows significant variation throughout the year. Expect heavy rainfall in December, the wettest month, with an average of 243 mm (9.6 in) of precipitation over 13 rainy days.
In contrast, the driest month July offers drier and sunnier days, with around 0.9 mm (0.04 in) of rainfall over a single rainy day. For more details, please visit our Guerneville Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Guerneville
For those who appreciate different seasons, Guerneville serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 10.3 hours of sunshine daily, and embrace the darker days in December, offering only 5.3 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Best Time to Visit Guerneville
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, June, July, August, September and October
- Warmest weather: June, July, August and September
- Most sunshine: April, May, June and July
- Fewest rainy days: June, July, August and September
- Wettest months: January, February, March, November and December, when rainfall is highest.
- Seasonal pattern: Distinct dry (May to September) and wet (December to February) seasons, with warm summers and mild winters
Frequently asked questions about the climate in Guerneville
What is the best time to visit Guerneville?
April, May, June, July, August, September and October typically offer the most optimal weather in Guerneville. In contrast, February and December tend to have less optimal conditions. Guerneville has distinct dry (May to September) and wet (December to February) seasons, with warm summers and mild winters.
What temperatures can I expect in Guerneville?
Daytime highs range from 14°C (57°F) in December to 28°C (82°F) in July. Nighttime lows range from 3°C (37°F) to 11°C (52°F). Temperatures vary considerably through the year.
How much rain does Guerneville get?
Annual rainfall is around 1082 mm (43 in). December is the wettest month with 243 mm (9.6 in), while July is the driest with 0.9 mm (0.04 in).
How sunny is Guerneville?
Guerneville receives around 3,042 hours of sunshine per year. May is the sunniest month with 310 hours, while December is the cloudiest with just 160 hours. Overall, Guerneville enjoys abundant sunshine.
Guerneville 3-Day Forecast
Guerneville (CA) 3-Day Forecast
Guerneville on the map
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