In May, McAllen typically sees daytime highs of 32.5°C and overnight lows around 21.1°C. Compared to the annual average high of 29.5°C, May runs +3.1°C.
May in McAllen averages a daytime high of 32.5°C and an overnight low of 21.1°C.
May runs +3.1°C compared to McAllen's annual average high of 29.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 32.5°C and cooler evenings around 21.1°C.