South San Francisco Weather in May

What's the weather like in South San Francisco (California) in May 2025?

The climate in South San Francisco during May can be summarized as mild and very dry.

May is in the spring in South San Francisco and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 9°C (49°F) is normal.

South San Francisco weather averages (imperial / metric)
Daytime temperature 18.4°C 65.1°F
Nightly temperature 9.2°C 48.6°F
Average temperature 13.8°C 56.8°F
Daily sunshine 11.5 hrs
Avg rainfall 8 mm 0.3 ins
Rainy days 3 days
Sea temperature 11.8°C 53.2°F
Humidity 70%
Windspeed 20.9kph 13 mph

On average May is the 5th driest month of the year in South San Francisco with around 8mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 11.5 hours of sunshine per day.

May temperatures in South San Francisco

South San Francisco average temperature in May

May rainfall

South San Francisco average rain in May

May hourly sunshine

South San Francisco 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 South San Francisco 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

South San Francisco weather stats

South San Francisco weather statistics
Hottest month: September 22.2°C 72°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.1hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 135mm 5.3ins
Map showing location of South San Francisco (37.65466, -122.40775) South San Francisco map pin © Google

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