Taking into account the local weather in Waisai is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually October and May with an average temp of 80°F, while the coldest months are July and August with an average of 79°F. The rainiest months in Waisai are April, May, March, and June, with each month seeing an average of 16 inches of rainfall.