San Francisco weather in August 2026

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

Daytime temperatures usually reach 30°C in San Francisco in August with moderate heat and humidity, falling to 18°C at night.

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

There are normally 11 hours of bright sunshine each day in San Francisco in August - that's 83% of daylight hours.

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

There is usually 1 day with some rain in San Francisco in August and the average monthly rainfall is 4mm.

Expect daytime maximum temperatures of 20°C in San Francisco, California in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

20
20°C max day temperature
10
10 hours of sunshine per day
1
1 day with some rainfall
13
13°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
2
2 mm of monthly rainfall
9
9 (Very High) UV index
14
14°C sea temperature

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The August 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 August?

Daytime temperatures usually reach 30°C in San Francisco in August with moderate heat and humidity, falling to 18°C at night.

How sunny is it in San Francisco in August?

There are normally 11 hours of bright sunshine each day in San Francisco in August - that's 83% of daylight hours.

Does it ever rain in San Francisco in August?

There is usually 1 day with some rain in San Francisco in August and the average monthly rainfall is 4mm.

San Francisco August sunrise & sunset times

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

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