In May, Dubuque typically sees daytime highs of 21.4°C and overnight lows around 8.9°C. Compared to the annual average high of 13.9°C, May runs +7.5°C.
May in Dubuque averages a daytime high of 21.4°C and an overnight low of 8.9°C.
May runs +7.5°C compared to Dubuque's annual average high of 13.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 21.4°C and cooler evenings around 8.9°C.