In May, Houston typically sees daytime highs of 29.5°C and overnight lows around 18.8°C. Compared to the annual average high of 26.2°C, May runs +3.3°C.
May in Houston averages a daytime high of 29.5°C and an overnight low of 18.8°C.
May runs +3.3°C compared to Houston's annual average high of 26.2°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 29.5°C and cooler evenings around 18.8°C.