Taking into account the local weather in Phumĭ Trâpeăng Rung can help you maximize your time at the pool during your trip. 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 Phumĭ Trâpeăng Rung are July, September, August, and June, with each month seeing an average of 23 inches of rainfall.