In May, San Antonio typically sees daytime highs of 30.1°C and overnight lows around 18.4°C. Compared to the annual average high of 26.8°C, May runs +3.3°C.
May in San Antonio averages a daytime high of 30.1°C and an overnight low of 18.4°C.
May runs +3.3°C compared to San Antonio's annual average high of 26.8°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 30.1°C and cooler evenings around 18.4°C.