In September, the weather in San-Carlos-de-Bariloche is typically cold. Average daily high temperature in September is about 6 degrees above zero. On average, San-Carlos-de-Bariloche has 9 partly cloudy, 8 rainy, 7 cloudy, and 6 sunny days in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit San-Carlos-de-Bariloche.