January in Florianopolis is the rainiest month of the year. In January, the weather in Florianopolis is typically warm. Average daily high temperature in January is about 26 degrees above zero. On average, Florianopolis has 20 rainy, 9 sunny, and 2 partly cloudy days in January. The rains are usually heavy. January as well as October and December is considered the most uncomfortable time to visit Florianopolis.