In May, Guelph typically sees daytime highs of 17.8°C and overnight lows around 5.6°C. Compared to the annual average high of 11.3°C, May runs +6.5°C.
May in Guelph averages a daytime high of 17.8°C and an overnight low of 5.6°C.
May runs +6.5°C compared to Guelph's annual average high of 11.3°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 17.8°C and cooler evenings around 5.6°C.