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
27°C max day temperature
10
10 hours of sunshine per day
1
1 day with some rainfall
18
18°C min night temperature
13
13 hours of daylight per day
M
Moderate heat & humidity
2
2 mm of monthly rainfall
10
10 (Very High) UV index
20
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)

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.

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

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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California - quick facts
Flight time^✝	11 hours
Time difference	UK -8 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Culture Nature Nightlife
Tourist info	Visit California