Is San Diego hot in December?
Days are typically mild at 18.6°C, while nights average 9.7°C.
United States · 1991–2020 normal
San Diego in
December.
Typical December weather in San Diego: 18.6°C by day, 9.7°C at night, 42 mm of rain over 4.2 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high18.6°C
Typical low9.7°C
Rain42 mm
Wet days4.2
In the year-round weather comparison, December scores 71 out of 100 (October leads the year at 96). Daylight is calculated as 10 h 00 from latitude 32.72°. Open-water sea temperature is 16.0°C (11 km from the place centre).
December at a glance
What is San Diego like in December?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 42 mm across about 4 wet days.
How much daylight is there?
There are about 10 h 00 between sunrise and sunset at mid-month, calculated from the place latitude.
Is December a good time to visit?
December ranks 10 of 12 in our weather comparison; October ranks first.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5391811
- NOAA station
- USW00023188 · SAN DIEGO INTL AP
- Station distance
- 2.6 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for San Diego is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work