San Diego weather in August 2025

Expect 27°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in San Diego in August. Check more long-term weather averages for San Diego in August before you book your next holiday to California in 2025/2026.

  • 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

More about San Diego

San Diego by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for California

TUI: up to 7% off holidays booked online

  • Book online with TUI & save up to 7% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

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)

Back to top

More about California

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^