In May, Lethbridge typically sees daytime highs of 17.7°C and overnight lows around 3.8°C. Compared to the annual average high of 11.9°C, May runs +5.8°C.
May in Lethbridge averages a daytime high of 17.7°C and an overnight low of 3.8°C.
May runs +5.8°C compared to Lethbridge's annual average high of 11.9°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 17.7°C and cooler evenings around 3.8°C.