San Jose, California weather in December

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

Average high: 59°F
Average low: 45°F
Rainy days: ~11 per month
Total precipitation: 5.9 in
Warmest recorded: 72°F
Coldest recorded: 33°F

Expect December days in San Jose, California to top out around 59°F and cool to about 45°F overnight, with roughly 11 days of measurable rain across the month. In recent years December has ranged from 33°F to 72°F.

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