Taking into account the local weather in Ulm is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and August with an average temp of 66°F, while the coldest months are February and December with an average of 27°F. The snowiest months in Ulm are February, October, March, and January, with each month seeing an average of 11 inches of snowfall.