May in San Antonio averages a daily high of 30.5°C with nights around 18.9°C. Expect roughly 7.5 wet days totalling 80.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit San Antonio is February–April.
Based on SAN ANTONIO INCARNATE WORD, TX US (5.5km), 1995–2024. 22 years of May data.