September in Bonito is the windiest and the sunniest month of the year. In September, the weather in Bonito is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, Bonito has 18 partly cloudy, 7 sunny, 3 cloudy, and 2 rainy days in September. The rains are usually light. September as well as June and August is considered the most comfortable time to visit Bonito.