In May, Koshigaya typically sees daytime highs of 22.8°C and overnight lows around 14.1°C. Compared to the annual average high of 19.6°C, May runs +3.2°C.
May in Koshigaya averages a daytime high of 22.8°C and an overnight low of 14.1°C.
May runs +3.2°C compared to Koshigaya's annual average high of 19.6°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.8°C and cooler evenings around 14.1°C.