Weather will likely play an important role when you plan your trip to Pirenópolis, 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 76°F, while the coldest months are July and June with an average of 72°F. The rainiest months in Pirenópolis are December, January, November, and February, with each month seeing an average of 11 inches of rainfall.