September in Miramichi is the sunniest month of the year. In September, the weather in Miramichi is typically warm. Average daily high temperature in September is about 18 degrees above zero. On average, Miramichi has 13 sunny, 13 partly cloudy, and 4 rainy 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 Miramichi.