In May, Charleston typically sees daytime highs of 27.5°C and overnight lows around 16.9°C. Compared to the annual average high of 23.5°C, May runs +4.0°C.
May in Charleston averages a daytime high of 27.5°C and an overnight low of 16.9°C.
May runs +4.0°C compared to Charleston's annual average high of 23.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 27.5°C and cooler evenings around 16.9°C.