Taking into account the local weather in Mongua is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually February and January with an average temp of 55°F, while the coldest months are August and September with an average of 54°F. The rainiest months in Mongua are April, May, October, and March, with each month seeing an average of 19 inches of rainfall.