In September, the weather in Sault Ste. Marie is typically warm. Average daily high temperature in September is about 17 degrees above zero. On average, Sault Ste. Marie has 14 sunny, 10 partly cloudy, and 6 rainy days in September. The rains are usually moderate. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Sault Ste. Marie.