San Antonio, Texas weather in May

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

Average high: 88°F
Average low: 69°F
Rainy days: ~14 per month
Total precipitation: 7.3 in
Warmest recorded: 101°F
Coldest recorded: 58°F

Expect May days in San Antonio, Texas to top out around 88°F and cool to about 69°F overnight, with roughly 14 days of measurable rain across the month. In recent years May has ranged from 58°F to 101°F.

Other months

January February March April June July August September October November December

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