Planning for the weather is an important factor for making your trip to Curitiba a success, especially when you're splurging. The hottest months are usually January and February, with an average temperature of 20°C, while the coldest months are July and June, with an average of 15°C. The rainiest months in Curitiba are January, February, December and October, with each month seeing an average of 221 mm of rainfall.