August in Joacaba is the sunniest month of the year. In August, the weather in Joacaba is typically warm. Average daily high temperature in August is about 20 degrees above zero. On average, Joacaba has 16 sunny, 8 rainy, 6 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as April and September is considered the most comfortable time to visit Joacaba.