Weather is probably a major factor when you plan your trip to Sault Ste. Marie, but bear 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 temperature of 16°C, while the coldest months are February and January, with an average of -7°C. The snowiest months in Sault Ste. Marie are April, November, January and February, with each month seeing an average of 51 cm of snowfall.