May in Florianopolis is the sunniest month of the year. In May, the weather in Florianopolis is typically warm. Average daily high temperature in May is about 21 degrees above zero. On average, Florianopolis has 14 sunny, 8 partly cloudy, 7 rainy, and 2 cloudy days in May. The rains are usually moderate. May as well as April, June, and July is considered the most comfortable time to visit Florianopolis.