Planning for the weather is a good way to make your trip to Praia Grande relaxing and enjoyable, especially when you're splurging. The hottest months are usually February and January with an average temp of 73°F, while the coldest months are July and June with an average of 61°F. The rainiest months in Praia Grande are September, January, October, and March, with each month seeing an average of 8 inches of rainfall.