Month-by-month travel weather
San Diego December weather
San Diego, United States · December
Wet-season entry: rain can shift plans more than you expect
December moves into the wetter season. Temperatures remain mild, but rain can make it feel cooler quickly.
Evenings can feel noticeably cooler, and rainy days can slow city timing—layers and a rain option help.
December averages at a glance
Average low
around 9–12°C
Average high
around 18–20°C
Average precipitation
around 25–60 mm
Rainy days
about 3–6 days
What to wear in December in San Diego
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light jacket/hoodie + layers works well.
- • Umbrella/light rain option helps.
- • Comfortable walking shoes help.
Travel tips for visiting San Diego in December
- • Build buffer time for rainy-day traffic.
- • If you’ll be out after dark, keep one extra layer.
December weather in San Diego — FAQ
Q. Is December cold?
A. Usually mild, but rain and late hours can feel cool.
Q. Does it rain often?
A. Rain becomes more likely as winter begins.
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