Month-by-month travel weather
San Diego January weather
San Diego, United States · January
Rainy days can feel cooler and affect timing
January sits in San Diego’s wetter season. Temperatures are usually mild, but rainy days can feel cooler and evenings can turn chilly.
Rain can slow traffic and logistics more than you expect in a typically dry region.
January averages at a glance
Average low
around 9–11°C
Average high
around 18–20°C
Average precipitation
around 40–70 mm
Rainy days
about 4–7 days
What to wear in January 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 January
- • On rainy days, build buffer time for traffic.
- • Coastal evenings can feel cooler—carry a layer.
January weather in San Diego — FAQ
Q. Is January cold?
A. Usually mild, but rain and late hours can feel cool.
Q. Does it rain often?
A. It’s one of the more rain-prone months, though totals vary year to year.
Explore San Diego
These pages are connected so you can compare conditions and decide for yourself.