September in Katsuta is the rainiest month of the year. In September, the weather in Katsuta is typically warm. Average daily high temperature in September is about 24 degrees above zero. On average, Katsuta has 19 rainy, 8 sunny, and 3 partly cloudy days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Katsuta.