August in Montbrison is the sunniest month of the year. In August, the weather in Montbrison is typically warm. Average daily high temperature in August is about 22 degrees above zero. On average, Montbrison has 15 sunny, 8 rainy, and 8 partly 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 Montbrison.