Guerneville Weather in May

What's the weather like in Guerneville (California) in May 2025?

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

May is in the spring in Guerneville and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a comfortable 24°C (75°F), whilst at night 9°C (48°F) is normal.

Guerneville weather averages (imperial / metric)
Daytime temperature 23.8°C 74.8°F
Nightly temperature 8.6°C 47.5°F
Average temperature 16.2°C 61.2°F
Daily sunshine 11.6 hrs
Avg rainfall 15 mm 0.6 ins
Rainy days 4 days
Sea temperature 11.8°C 53.2°F
Humidity 69%
Windspeed 18.4kph 11 mph

On average May is the 5th driest month of the year in Guerneville with around 15mm 0.6 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.6 hours of sunshine per day.

May temperatures in Guerneville

Guerneville average temperature in May

May rainfall

Guerneville average rain in May

May hourly sunshine

Guerneville average rain in May

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 May 2025.

Other monthly averages

Best places to visit in May

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Guerneville weather stats

Guerneville weather statistics
Hottest month: July 29.3°C 84.7°F
Driest month: July 2mm 0.1ins
Sunniest month: April 10.9hrs
Coldest month: January 13.3°C 55.9°F
Wettest month: January 234mm 9.2ins
Map showing location of Guerneville (38.50186, -122.99611) Guerneville map pin © Google

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