San Diego Weather in December – Average Temperature and Rainfall
- High
- 18.2°
- Low
- 9.3°
- Rainfall
- 56 mm
- Rainy season
- 5d
- max
- 26.9°
- min
- 4.0°
December
- Early
- 19.1° 15.3 mm
- Mid
- 18.3° 8.0 mm
- Late
- 17.2° 32.4 mm
Summary
The climate figures for San Diego are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 359 mm.
The rainy season runs –. The wettest month is January with 73.6 mm across 6 rain days; the driest is June at just 2.3 mm.
The hottest month is August (average high 25.4°C) and the coolest is January (17.4°C).
The most comfortable time to visit San Diego is June — less rain and milder heat.
Monthly averages
Common questions
Will it rain in San Diego today?
No. The chance of rain today is only about 6%.
How hot is it in San Diego today?
Between 19°C and 24°C, with a felt maximum of 26°C.
What is the weather in San Diego tomorrow?
Tomorrow: overcast, 20–24°C, with a 1% chance of rain.