Guerneville Weather in October

The climate in Guerneville during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Guerneville and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 25°C (76°F), whilst at night 8°C (47°F) is normal.

On average October is the 6th driest month of the year in Guerneville with around 62mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.7 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Guerneville in October 2025.