May in Balneário Camboriú is the sunniest month of the year. In May, the weather in Balneário Camboriú is typically warm. Average daily high temperature in May is about 21 degrees above zero. On average, Balneário Camboriú has 12 rainy, 10 sunny, 7 partly cloudy, and 2 cloudy days in May. The rains are usually heavy.