Planning for the weather is an important factor for making your trip to Zell am Ziller a success, especially when you're splurging. The hottest months are usually July and August with an average temp of 54°F, while the coldest months are January and February with an average of 26°F. The rainiest months in Zell am Ziller are July, June, May, and August, with each month seeing an average of 10 inches of rainfall.