Taking the local weather in Ko Phra Thong into account can help you maximise your time at the pool during your trip. The hottest months are usually March and April, with an average temperature of 27°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Ko Phra Thong are September, October, July and August, with each month seeing an average of 373 mm of rainfall.