Weather is probably a major factor when you plan your trip to Itapecerica, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October with an average temp of 71°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Itapecerica are December, January, November, and March, with each month seeing an average of 10 inches of rainfall.