Taking into account the local weather in Koh Kong is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually April and March with an average temp of 80°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Koh Kong are July, September, August, and June, with each month seeing an average of 23 inches of rainfall.