Weather will likely play an important role when you plan your trip to Praia Grande, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 77°F, while the coldest months are July and August with an average of 68°F. The rainiest months in Praia Grande are January, December, March, and February, with each month seeing an average of 10 inches of rainfall.