September in Cachoeiro de Itapemirim is the windiest month of the year. In September, the weather in Cachoeiro de Itapemirim is typically warm. Average daily high temperature in September is about 27 degrees above zero. On average, Cachoeiro de Itapemirim has 12 sunny, 10 rainy, 7 partly cloudy, and 1 cloudy day in September. The rains are usually moderate.