April in Fredericton is the rainiest month of the year. In April, the weather in Fredericton is typically cold. Average daily high temperature in April is about 7 degrees above zero. On average, Fredericton has 16 rainy, 6 cloudy, 4 sunny, and 4 partly cloudy days in April. The rains are usually heavy. April as well as May, October, and November is considered the most uncomfortable time to visit Fredericton.