In May, Joetsu typically sees daytime highs of 21.0°C and overnight lows around 9.9°C. Compared to the annual average high of 17.1°C, May runs +3.9°C.
May in Joetsu averages a daytime high of 21.0°C and an overnight low of 9.9°C.
May runs +3.9°C compared to Joetsu's annual average high of 17.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 21.0°C and cooler evenings around 9.9°C.