In May, the weather in Rouyn-Noranda is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Rouyn-Noranda has 15 rainy, 10 cloudy, 4 sunny, and 2 partly cloudy days in May. The rains are usually heavy. May as well as January, February, April, and October is considered the most uncomfortable time to visit Rouyn-Noranda.