In May, Iwaki typically sees daytime highs of 18.8°C and overnight lows around 11.3°C. Compared to the annual average high of 15.3°C, May runs +3.6°C.
May in Iwaki averages a daytime high of 18.8°C and an overnight low of 11.3°C.
May runs +3.6°C compared to Iwaki's annual average high of 15.3°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 18.8°C and cooler evenings around 11.3°C.