San Francisco, California weather in December

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

Average high: 56°F
Average low: 47°F
Rainy days: ~13 per month
Total precipitation: 7.5 in
Warmest recorded: 67°F
Coldest recorded: 39°F

Expect December days in San Francisco, California to top out around 56°F and cool to about 47°F overnight, with roughly 13 days of measurable rain across the month. In recent years December has ranged from 39°F to 67°F.

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