San Diego weather in December 2025

Expect daytime maximum temperatures of 66°F in San Diego, California in December based on long-term weather averages. There are 8 hours of sunshine per day on average.

  • 66°F maximum daytime temperature in December in San Diego66
    66°F max day temperature
  • 8 hours of sunshine per day
  • 5 days with some rainfall in December in San Diego5
    5 days with some rainfall
  • 46°F minimum night-time temperature in December in San Diego46
    46°F min night temperature
  • 10 hours of daylight per day in December in San Diego10
    10 hours of daylight per day
  • No heat & humidity in December in San Diego0
    No heat & humidity
  • 1.5 inches monthly rainfall in December in San Diego1.5
    1.5 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in December in San Diego3
    3 (Moderate) UV index
  • 59°F sea temperature in December in San Diego59
    59°F sea temperature

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The December weather guide for California (San Diego) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about California

How hot is it in San Diego in December?

Daytime temperatures usually reach 66°F in San Diego in December, falling to 46°F at night.

How sunny is it in San Diego in December?

There are normally 8 hours of bright sunshine each day in San Diego in December - that's 75% of daylight hours.

How warm is the sea around San Diego in December?

The average sea temperature around San Diego in December is 59°F.

Does it rain in San Diego in December?

There are usually 5 days with some rain in San Diego in December and the average monthly rainfall is 1.5 inches.

San Diego December sunrise & sunset times

Browse the sunrise and sunset times for San Diego in December 2025. Select a month to view San Diego sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:33 16:42
Tuesday, 16th December 2025 06:44 16:45
Wednesday, 31st December 2025 06:51 16:53

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