In May, Thunder Bay typically sees daytime highs of 15.8°C and overnight lows around 2.4°C. Compared to the annual average high of 8.0°C, May runs +7.8°C.
May in Thunder Bay averages a daytime high of 15.8°C and an overnight low of 2.4°C.
May runs +7.8°C compared to Thunder Bay's annual average high of 8.0°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 15.8°C and cooler evenings around 2.4°C.