In May, Iwamizawa typically sees daytime highs of 17.0°C and overnight lows around 6.3°C. Compared to the annual average high of 11.4°C, May runs +5.6°C.
May in Iwamizawa averages a daytime high of 17.0°C and an overnight low of 6.3°C.
May runs +5.6°C compared to Iwamizawa's annual average high of 11.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 17.0°C and cooler evenings around 6.3°C.