Taking into account the local weather in Rio dos Cedros 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 74°F, while the coldest months are July and June with an average of 62°F. The rainiest months in Rio dos Cedros are January, February, March, and December, with each month seeing an average of 8 inches of rainfall.