Planning for the weather is a good way to make your trip to Florianópolis relaxing and enjoyable, especially when you’re splurging. The hottest months are usually January and February, with an average temperature of 24°C, while the coldest months are July and August, with an average of 17°C. The rainiest months in Florianópolis are January, February, December and March, with each month seeing an average of 217 mm of rainfall.