Weather will likely play an important role when you plan your trip to Ko Taphao, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are January and December, with an average of 24°C. The rainiest months in Ko Taphao are September, August, July and May, with each month seeing an average of 195 mm of rainfall.