In May, Montreal typically sees daytime highs of 18.5°C and overnight lows around 6.7°C. Compared to the annual average high of 10.8°C, May runs +7.7°C.
May in Montreal averages a daytime high of 18.5°C and an overnight low of 6.7°C.
May runs +7.7°C compared to Montreal's annual average high of 10.8°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.5°C and cooler evenings around 6.7°C.