In May, Ko Samui typically sees daytime highs of 31.7°C and overnight lows around 25.1°C. Compared to the annual average high of 30.3°C, May runs +1.4°C.
May in Ko Samui averages a daytime high of 31.7°C and an overnight low of 25.1°C.
May runs +1.4°C compared to Ko Samui's annual average high of 30.3°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 31.7°C and cooler evenings around 25.1°C.