San Francisco weather in August 2025

Expect 68°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in San Francisco in August. Check more long-term weather averages for San Francisco in August before you book your next holiday to California in 2025/2026.

  • 68°F maximum daytime temperature in August in San Francisco68
    68°F max day temperature
  • 10 hours of sunshine per day
  • 1 day with some rainfall in August in San Francisco1
    1 day with some rainfall
  • 55°F minimum night-time temperature in August in San Francisco55
    55°F min night temperature
  • 14 hours of daylight per day in August in San Francisco14
    14 hours of daylight per day
  • No heat & humidity in August in San Francisco0
    No heat & humidity
  • 0.1 inches monthly rainfall in August in San Francisco0.1
    0.1 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in San Francisco9
    9 (Very High) UV index
  • 57°F sea temperature in August in San Francisco57
    57°F 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)  |  Imperial (°F)

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More about San Francisco

How hot is it in San Francisco in August?

Daytime temperatures usually reach 68°F in San Francisco in August, falling to 55°F at night.

How sunny is it in San Francisco in August?

There are normally 10 hours of bright sunshine each day in San Francisco in August - that's 70% of daylight hours.

How warm is the sea around San Francisco in August?

The average sea temperature around San Francisco in August is 57°F.

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 0.1 inches.

San Francisco August sunrise & sunset times

Browse the sunrise and sunset times for San Francisco in August 2025. Select a month to view San Francisco sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:14 19:18
Saturday, 16th August 2025 05:26 19:01
Sunday, 31st August 2025 05:39 18:40

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