In May, Niihama typically sees daytime highs of 20.1°C and overnight lows around 12.0°C. Compared to the annual average high of 17.0°C, May runs +3.1°C.
May in Niihama averages a daytime high of 20.1°C and an overnight low of 12.0°C.
May runs +3.1°C compared to Niihama's annual average high of 17.0°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 20.1°C and cooler evenings around 12.0°C.