San Diego Weather in December
United States · 30-year monthly averages
🌟 Great time to visit
December in San Diego is mild, with average daytime highs around 19°C (66°F) and nighttime lows near 10°C (50°F). Expect roughly 43mm of precipitation spread over about 4 rainy days, with little rainfall.
Avg high
19°C
66°F
Avg low
10°C
50°F
Rainfall
43mm
dry
Rainy days
4
days with ≥1mm
🎒 What to pack
- light jacket
- layers for cool evenings
December vs the rest of the year
FAQ
- How hot is San Diego in December?
- December in San Diego is mild, with average daytime highs around 19°C (66°F) and nighttime lows near 10°C (50°F). Expect roughly 43mm of precipitation spread over about 4 rainy days, with little rainfall.
- Does it rain a lot in San Diego in December?
- San Diego sees around 43mm of precipitation in December on average — dry by global standards.
- Is December a good time to visit San Diego?
- December is one of the best months to visit San Diego — comfortable temperatures and manageable rainfall.