In May, Seongnam-si typically sees daytime highs of 22.9°C and overnight lows around 11.1°C. Compared to the annual average high of 16.1°C, May runs +6.9°C.
May in Seongnam-si averages a daytime high of 22.9°C and an overnight low of 11.1°C.
May runs +6.9°C compared to Seongnam-si's annual average high of 16.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.9°C and cooler evenings around 11.1°C.