August in Bonita Springs is the rainiest and the hottest month of the year. In August, the weather in Bonita Springs is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Bonita Springs has 22 rainy, 4 sunny, 3 partly cloudy, and 2 cloudy days in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Bonita Springs.