Taking into account the local weather in Mulu is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually May and March with an average temp of 72°F, while the coldest months are July and August with an average of 71°F. The rainiest months in Mulu are November, January, December, and March, with each month seeing an average of 19 inches of rainfall.