April in Rexburg is the rainiest month of the year. In April, the weather in Rexburg is typically warm. Average daily high temperature in April is about 14 degrees above zero. On average, Rexburg has 10 rainy, 10 sunny, 6 partly cloudy, and 4 cloudy days in April. The rains are usually light. April as well as January, February, March, and November is considered the most uncomfortable time to visit Rexburg.