San Diego weather in January 2026

Expect daytime maximum temperatures of 66°F in San Diego, California in January based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 2.1 inches of rainfall in the month.

  • 66°F maximum daytime temperature in January in San Diego66
    66°F max day temperature
  • 8 hours of sunshine per day
  • 6 days with some rainfall in January in San Diego6
    6 days with some rainfall
  • 45°F minimum night-time temperature in January in San Diego45
    45°F min night temperature
  • 10 hours of daylight per day in January in San Diego10
    10 hours of daylight per day
  • No heat & humidity in January in San Diego0
    No heat & humidity
  • 2.1 inches monthly rainfall in January in San Diego2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in January in San Diego3
    3 (Moderate) UV index
  • 59°F sea temperature in January in San Diego59
    59°F sea temperature

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The January 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 January?

Daytime temperatures usually reach 66°F in San Diego in January, falling to 45°F at night.

How sunny is it in San Diego in January?

There are normally 8 hours of bright sunshine each day in San Diego in January - that's 76% of daylight hours.

How warm is the sea around San Diego in January?

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

Does it rain in San Diego in January?

There are usually 6 days with some rain in San Diego in January and the average monthly rainfall is 2.1 inches.

San Diego January sunrise & sunset times

Browse the sunrise and sunset times for San Diego in January 2026. Select a month to view San Diego sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 06:51 16:54
Friday, 16th January 2026 06:51 17:07
Saturday, 31st January 2026 06:44 17:21

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