The climate in San Francisco during May can be summarized as mild and very dry.
May is in the spring in San Francisco and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 10°C (50°F) is normal.
|Daytime temperature||18.1°C 64.5°F|
|Nightly temperature||10°C 49.9°F|
|Average temperature||14°C 57.2°F|
|Daily sunshine||11.4 hrs|
|Avg rainfall||7 mm 0.3 ins|
|Rainy days||3 days|
|Sea temperature||11.8°C 53.2°F|
|Windspeed||20.5kph 13 mph|
On average May is the 5th driest month of the year in San Francisco with around 7mm 0.3 inches of rain making it a very dry time to visit.
On the flip side this corresponds to an average of 11.4 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 San Francisco in May 2021.
|Hottest month:||September||21.4°C 70.5°F|
|Driest month:||July||1mm 0ins|
|Coldest month:||January||13.2°C 55.8°F|
|Wettest month:||January||125mm 4.9ins|