San Diego, California weather in August

Averages from 2021–2025 (155 days of record).

Average high: 78°F
Average low: 65°F
Rainy days: ~1 per month
Total precipitation: 0.5 in
Warmest recorded: 86°F
Coldest recorded: 59°F

Expect August days in San Diego, California to top out around 78°F and cool to about 65°F overnight, with roughly 1 days of measurable rain across the month. In recent years August has ranged from 59°F to 86°F.

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Current San Diego, California forecast → · Historical data by Open-Meteo (ERA5).