In May, Perth typically sees daytime highs of 20.9°C and overnight lows around 10.8°C. Compared to the annual average high of 23.6°C, May runs -2.7°C.
May in Perth averages a daytime high of 20.9°C and an overnight low of 10.8°C.
May runs -2.7°C compared to Perth's annual average high of 23.6°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 20.9°C and cooler evenings around 10.8°C.