San Francisco weather in August 2025

Expect 20°C 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.

• 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)

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More about San Francisco

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.

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