San Francisco weather in May 2026

Q: How hot is it in San Francisco in May?

Daytime temperatures usually reach 23°C in San Francisco in May, falling to 13°C at night.

Q: How sunny is it in San Francisco in May?

There are normally 9 hours of bright sunshine each day in San Francisco in May - that's 65% of daylight hours.

Q: Does it ever rain in San Francisco in May?

There is usually 1 day with some rain in San Francisco in May and the average monthly rainfall is 5mm.

Expect daytime maximum temperatures of 18°C in San Francisco, California in May based on long-term weather averages. There are 11 hours of sunshine per day on average.

18
18°C max day temperature
11
11 hours of sunshine per day
3
3 days with some rainfall
10
10°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
7
7 mm of monthly rainfall
8
8 (Very High) UV index
11
11°C sea temperature

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The May weather guide for California (San Francisco) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about San Francisco

How hot is it in San Francisco in May?

Daytime temperatures usually reach 23°C in San Francisco in May, falling to 13°C at night.

How sunny is it in San Francisco in May?

There are normally 9 hours of bright sunshine each day in San Francisco in May - that's 65% of daylight hours.

Does it ever rain in San Francisco in May?

There is usually 1 day with some rain in San Francisco in May and the average monthly rainfall is 5mm.

San Francisco May sunrise & sunset times

Browse the sunrise and sunset times for San Francisco in May 2026. Select a month to view San Francisco sunrise and sunset times for the next 12 months.

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