In May, the weather in Zell am Ziller is typically warm. Average daily high temperature in May is about 12 degrees above zero. On average, Zell am Ziller has 20 rainy, 5 partly cloudy, 4 sunny, and 2 cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit Zell am Ziller.