September in Comodoro Rivadavia is the rainiest month of the year. In September, the weather in Comodoro Rivadavia is typically warm. Average daily high temperature in September is about 11 degrees above zero. On average, Comodoro Rivadavia has 14 sunny, 8 partly cloudy, 6 rainy, and 2 cloudy days in September. The rains are usually light. September as well as May, June, July, and August is considered the most uncomfortable time to visit Comodoro Rivadavia.