San Diego weather in May 2025

Expect 21°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in San Diego in May. Check more long-term weather averages for San Diego in May before you book your next holiday to California in 2025/2026.

  • 21°C maximum daytime temperature in May in San Diego21
    21°C max day temperature
  • 8 hours of sunshine per day
  • 2 days with some rainfall in May in San Diego2
    2 days with some rainfall
  • 13°C minimum night-time temperature in May in San Diego13
    13°C min night temperature
  • 14 hours of daylight per day in May in San Diego14
    14 hours of daylight per day
  • No heat & humidity in May in San Diego0
    No heat & humidity
  • 5 mm monthly rainfall in May in San Diego5
    5 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in San Diego9
    9 (Very High) UV index
  • 17°C sea temperature in May in San Diego17
    17°C sea temperature

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The May 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 / mm)  |  Imperial (°F / inches)

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More about California

How hot is it in San Diego in May?

Daytime temperatures usually reach 21°C in San Diego in May, falling to 13°C at night.

How sunny is it in San Diego in May?

There are normally 8 hours of bright sunshine each day in San Diego in May - that's 61% of daylight hours.

How warm is the sea around San Diego in May?

The average sea temperature around San Diego in May is 17°C.

Does it ever rain in San Diego in May?

There are usually 2 days with some rain in San Diego in May and the average monthly rainfall is 5mm.

San Diego May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:01 18:31
Friday, 16th May 2025 04:49 18:42
Saturday, 31st May 2025 04:42 18:51

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