Sea temperature on Chang Island

The Gulf of Thailand belongs to the South China Sea, which in turn belongs to the Pacific Ocean. However, its depth is not too great. The temperature in the Gulf of Thailand near Ko Chang Island ranges from +25°C in January to +31°C in August. Thus, the temperature of the Gulf of Thailand never falls below the mark comfortable for swimming.

The waves of the Gulf of Thailand near Koh Chang are strongest from June to October, with heavy rains, low tides on the beaches, and dangerous undercurrents. And, in addition, in summer there are a lot of jellyfish. The eastern, mainland side of the island usually has fewer currents, but it has rocky shores and the surf can be strong.

The tides here are particularly noticeable from May to September, and can be quite high. The South China Sea is fastidious, and its ebb and flow can spoil a vacation, especially when the sea recedes, leaving meters of widened beach.

On White Sand beach, in the south of the island, around Bang Bao and further east, the sea movement isn't as serious. For details of the peculiar and whimsical tide schedule, check locally; for many beaches it's individual, depending on the slope of the bottom and the position of the island, the time of year, and the phase of the moon.