Planning for the weather is a good way to make your trip to Khong Island relaxing and enjoyable, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 31°C, while the coldest months are January and December, with an average of 27°C. The rainiest months in Khong Island are August, September, July and June, with each month seeing an average of 416 mm of rainfall.