Taking into account the local weather in Morretes 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 76°F, while the coldest months are July and August with an average of 64°F. The rainiest months in Morretes are January, February, March, and December, with each month seeing an average of 11 inches of rainfall.