In May, Iowa City typically sees daytime highs of 22.7°C and overnight lows around 9.8°C. Compared to the annual average high of 15.4°C, May runs +7.3°C.
May in Iowa City averages a daytime high of 22.7°C and an overnight low of 9.8°C.
May runs +7.3°C compared to Iowa City's annual average high of 15.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.7°C and cooler evenings around 9.8°C.