In May, Sayama typically sees daytime highs of 23.0°C and overnight lows around 12.9°C. Compared to the annual average high of 19.4°C, May runs +3.6°C.
May in Sayama averages a daytime high of 23.0°C and an overnight low of 12.9°C.
May runs +3.6°C compared to Sayama's annual average high of 19.4°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 23.0°C and cooler evenings around 12.9°C.