In May, Waterloo typically sees daytime highs of 22.1°C and overnight lows around 9.0°C. Compared to the annual average high of 14.4°C, May runs +7.8°C.
May in Waterloo averages a daytime high of 22.1°C and an overnight low of 9.0°C.
May runs +7.8°C compared to Waterloo's annual average high of 14.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.1°C and cooler evenings around 9.0°C.