In May, Osan typically sees daytime highs of 23.4°C and overnight lows around 10.9°C. Compared to the annual average high of 16.5°C, May runs +6.9°C.
May in Osan averages a daytime high of 23.4°C and an overnight low of 10.9°C.
May runs +6.9°C compared to Osan's annual average high of 16.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 23.4°C and cooler evenings around 10.9°C.