Weather is probably a major factor when you plan your trip to Guarapuava, 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 68°F, while the coldest months are July and June with an average of 57°F. The rainiest months in Guarapuava are January, October, December, and February, with each month seeing an average of 9 inches of rainfall.