In September, the weather in San-Carlos-de-Bariloche is typically cold. Average daily high temperature in September is about 5 degrees above zero. On average, San-Carlos-de-Bariloche has 9 rainy, 9 cloudy, 6 sunny, and 6 partly cloudy days in September. The rains are usually moderate. September as well as May, June, July, and August is considered the most uncomfortable time to visit San-Carlos-de-Bariloche.