In May, Waukesha typically sees daytime highs of 19.7°C and overnight lows around 7.6°C. Compared to the annual average high of 12.9°C, May runs +6.9°C.
May in Waukesha averages a daytime high of 19.7°C and an overnight low of 7.6°C.
May runs +6.9°C compared to Waukesha's annual average high of 12.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 19.7°C and cooler evenings around 7.6°C.