Planning for the weather is an important factor for making your trip to Ko Yao a success, especially when you’re splurging. The hottest months are usually March and April, with an average temperature of 28°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Ko Yao are September, October, July and August, with each month seeing an average of 345 mm of rainfall.