In May, Saint John typically sees daytime highs of 14.9°C and overnight lows around 4.2°C. Compared to the annual average high of 10.4°C, May runs +4.6°C.
May in Saint John averages a daytime high of 14.9°C and an overnight low of 4.2°C.
May runs +4.6°C compared to Saint John's annual average high of 10.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 14.9°C and cooler evenings around 4.2°C.