In May, Port Saint Mary typically sees daytime highs of 12.5°C and overnight lows around 7.4°C. Compared to the annual average high of 11.6°C, May runs +0.9°C.
May in Port Saint Mary averages a daytime high of 12.5°C and an overnight low of 7.4°C.
May runs +0.9°C compared to Port Saint Mary's annual average high of 11.6°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 12.5°C and cooler evenings around 7.4°C.