September in St Jerome is the sunniest month of the year. In September, the weather in St Jerome is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, St Jerome has 16 sunny, 7 rainy, and 7 partly cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit St Jerome.