In September, the weather in Zell am Ziller is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Zell am Ziller has 20 rainy, 6 sunny, 3 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 Zell am Ziller.