September in Bandundu is the windiest month of the year. In September, the weather in Bandundu is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Bandundu has 27 rainy, 2 sunny, and 1 partly cloudy day in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Bandundu.