In April, the weather in Leavenworth is typically cold. Average daily high temperature in April is about 8 degrees above zero. On average, Leavenworth has 8 cloudy, 8 partly cloudy, 7 rainy, 6 sunny, and 1 snowy day in April. The rains are usually moderate. April as well as January, February, March, and May is considered the most uncomfortable time to visit Leavenworth.