In May, Port Arthur typically sees daytime highs of 27.6°C and overnight lows around 19.9°C. Compared to the annual average high of 24.3°C, May runs +3.2°C.
May in Port Arthur averages a daytime high of 27.6°C and an overnight low of 19.9°C.
May runs +3.2°C compared to Port Arthur's annual average high of 24.3°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 27.6°C and cooler evenings around 19.9°C.