In September, the weather in Sankt Anton am Arlberg is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Sankt Anton am Arlberg has 18 rainy, 7 sunny, 4 partly cloudy, and 1 cloudy day 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.