September in Paris is the sunniest month of the year. In September, the weather in Paris is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Paris has 21 sunny, 5 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 Paris.