You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. The hottest months are usually July and August with an average temp of 61°F, while the coldest months are February and January with an average of 20°F. The snowiest months in Sault Ste. Marie are April, November, January, and February, with each month seeing an average of 20 inches of snowfall.