In May, San Antonio typically sees daytime highs of 25.5°C and overnight lows around 14.7°C. Compared to the annual average high of 28.9°C, May runs -3.4°C.
May in San Antonio averages a daytime high of 25.5°C and an overnight low of 14.7°C.
May runs -3.4°C compared to San Antonio's annual average high of 28.9°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 25.5°C and cooler evenings around 14.7°C.