San Francisco, California weather in August

Averages from 2021–2025 (155 days of record).

Average high: 68°F
Average low: 57°F
Rainy days: ~0 per month
Total precipitation: 0.0 in
Warmest recorded: 84°F
Coldest recorded: 53°F

Expect August days in San Francisco, California to top out around 68°F and cool to about 57°F overnight, with roughly 0 days of measurable rain across the month. In recent years August has ranged from 53°F to 84°F.

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Current San Francisco, California forecast → · Historical data by Open-Meteo (ERA5).