In May, Rockville typically sees daytime highs of 24.0°C and overnight lows around 10.6°C. Compared to the annual average high of 18.5°C, May runs +5.5°C.
May in Rockville averages a daytime high of 24.0°C and an overnight low of 10.6°C.
May runs +5.5°C compared to Rockville's annual average high of 18.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 24.0°C and cooler evenings around 10.6°C.