In May, the weather in Riviere Du Loup is typically warm. Average daily high temperature in May is about 11 degrees above zero. On average, Riviere Du Loup has 13 rainy, 8 sunny, 7 partly cloudy, and 3 cloudy days in May. The rains are usually heavy. May as well as April, October, and November is considered the most uncomfortable time to visit Riviere Du Loup.