Planning for the weather is a good way to make your trip to Itapema relaxing and enjoyable, especially when you’re splurging. The hottest months are usually February and January with an average temp of 75°F, while the coldest months are July and August with an average of 63°F. The rainiest months in Itapema are January, February, March, and December, with each month seeing an average of 7 inches of rainfall.