August in Roissy-en-France is the sunniest month of the year. In August, the weather in Roissy-en-France is typically warm. Average daily high temperature in August is about 22 degrees above zero. On average, Roissy-en-France has 11 partly cloudy, 10 sunny, 8 rainy, and 2 cloudy days in August. The rains are usually moderate. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Roissy-en-France.