Weather will likely play an important role when you plan your trip to Cascavel, but bear 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 temperature of 23°C, while the coldest months are July and June, with an average of 16°C. The rainiest months in Cascavel are October, December, January and February, with each month seeing an average of 222 mm of rainfall.