April in Sapporo is the sunniest month of the year. In April, the weather in Sapporo is typically cold. Average daily high temperature in April is about 9 degrees above zero. On average, Sapporo has 10 rainy, 9 sunny, 6 partly cloudy, and 5 cloudy days in April. The rains are usually moderate. April as well as October, November, and December is considered the most uncomfortable time to visit Sapporo.