September in Itabaiana is the sunniest month of the year. In September, the weather in Itabaiana is typically warm. Average daily high temperature in September is about 27 degrees above zero. On average, Itabaiana has 17 sunny, 7 rainy, and 6 partly cloudy days in September. The rains are usually light. September as well as November and December is considered the most comfortable time to visit Itabaiana.