San Antonio, Texas weather in August

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

Average high: 97°F
Average low: 77°F
Rainy days: ~9 per month
Total precipitation: 2.4 in
Warmest recorded: 107°F
Coldest recorded: 73°F

Expect August days in San Antonio, Texas to top out around 97°F and cool to about 77°F overnight, with roughly 9 days of measurable rain across the month. In recent years August has ranged from 73°F to 107°F.

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