San Diego, California weather in December

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

Average high: 65°F
Average low: 49°F
Rainy days: ~5 per month
Total precipitation: 1.6 in
Warmest recorded: 80°F
Coldest recorded: 40°F

Expect December days in San Diego, California to top out around 65°F and cool to about 49°F overnight, with roughly 5 days of measurable rain across the month. In recent years December has ranged from 40°F to 80°F.

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