April in Rimouski is the rainiest month of the year. In April, the weather in Rimouski is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Rimouski has 13 rainy, 8 cloudy, 5 partly cloudy, and 4 sunny days in April. The rains are usually heavy. April as well as January, May, October, and November is considered the most uncomfortable time to visit Rimouski.