September in Rock Sound is the rainiest month of the year. In September, the weather in Rock Sound is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Rock Sound has 20 rainy, 6 sunny, 3 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as June, July, August, and October is considered the most uncomfortable time to visit Rock Sound.