Planning for the weather is a good way to make your trip to Nova Petropolis relaxing and enjoyable, especially when you're splurging. The hottest months are usually January and February, with an average temperature of 21°C, while the coldest months are July and June, with an average of 13°C. The rainiest months in Nova Petropolis are October, January, September and December, with each month seeing an average of 213 mm of rainfall.