Weather will likely play an important role when you plan your trip to Cascavel, 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 73°F, while the coldest months are July and June with an average of 61°F. The rainiest months in Cascavel are October, December, January, and February, with each month seeing an average of 9 inches of rainfall.