September in Gagnoa is the rainiest month of the year. In September, the weather in Gagnoa is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Gagnoa has 27 rainy, 2 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as March, April, May, and June is considered the most uncomfortable time to visit Gagnoa.