San Francisco, California weather in May

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

Average high: 63°F
Average low: 52°F
Rainy days: ~2 per month
Total precipitation: 0.5 in
Warmest recorded: 84°F
Coldest recorded: 45°F

Expect May days in San Francisco, California to top out around 63°F and cool to about 52°F overnight, with roughly 2 days of measurable rain across the month. In recent years May has ranged from 45°F to 84°F.

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