May in Riviere Du Loup is the rainiest month of the year. In May, the weather in Riviere Du Loup is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Riviere Du Loup has 14 rainy, 6 cloudy, 6 partly cloudy, and 5 sunny days in May. The rains are usually moderate. May as well as January, April, October, and November is considered the most uncomfortable time to visit Riviere Du Loup.