If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Iguape: The hottest months are usually February and January with an average temp of 76°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Iguape are January, February, March, and December, with each month seeing an average of 8 inches of rainfall.