December in Florianopolis is the cloudiest month of the year. In December, the weather in Florianopolis is typically warm. Average daily high temperature in December is about 26 degrees above zero. On average, Florianopolis has 21 rainy, 7 partly cloudy, 2 cloudy, and 1 sunny day in December. The rains are usually heavy. December as well as January, February, March, and October is considered the most uncomfortable time to visit Florianopolis.