In September, the weather in Sankt Anton am Arlberg is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Sankt Anton am Arlberg has 15 rainy, 6 sunny, 5 cloudy, and 4 partly cloudy 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 Sankt Anton am Arlberg.