Weather is probably a major factor when you plan your trip to Passo dello Stelvio, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 53°F, while the coldest months are January and February with an average of 22°F. The snowiest months in Passo dello Stelvio are April, May, November, and January, with each month seeing an average of 5 inches of snowfall.