Weather is probably a major factor when you plan your trip to Ponta Grossa, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually December and January with an average temp of 69°F, while the coldest months are July and June with an average of 58°F. The rainiest months in Ponta Grossa are January, December, October, and February, with each month seeing an average of 8 inches of rainfall.