If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Ponta Grossa: The hottest months are usually December and January, with an average temperature of 21°C, while the coldest months are July and June, with an average of 15°C. The rainiest months in Ponta Grossa are January, December, October and February, with each month seeing an average of 206 mm of rainfall.