San Diego weather in August 2025

Expect daytime maximum temperatures of 27°C in San Diego, California in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

  • 27°C maximum daytime temperature in August in San Diego27
    27°C max day temperature
  • 10 hours of sunshine per day
  • 1 day with some rainfall in August in San Diego1
    1 day with some rainfall
  • 18°C minimum night-time temperature in August in San Diego18
    18°C min night temperature
  • 13 hours of daylight per day in August in San Diego13
    13 hours of daylight per day
  • Moderate heat & humidity in August in San DiegoM
    Moderate heat & humidity
  • 2 mm monthly rainfall in August in San Diego2
    2 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in San Diego10
    10 (Very High) UV index
  • 20°C sea temperature in August in San Diego20
    20°C sea temperature

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The August 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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How hot is it in San Diego in August?

Daytime temperatures usually reach 27°C in San Diego in August with moderate heat and humidity, falling to 18°C at night.

How sunny is it in San Diego in August?

There are normally 10 hours of bright sunshine each day in San Diego in August - that's 73% of daylight hours.

How warm is the sea around San Diego in August?

The average sea temperature around San Diego in August is 20°C.

Does it ever rain in San Diego in August?

There is usually 1 day with some rain in San Diego in August and the average monthly rainfall is 2mm.

San Diego August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:03 18:47
Saturday, 16th August 2025 05:13 18:32
Sunday, 31st August 2025 05:23 18:14

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