April in Sapporo is the windiest month of the year. In April, the weather in Sapporo is typically cold. Average daily high temperature in April is about 8 degrees above zero. On average, Sapporo has 16 rainy, 7 sunny, 6 partly cloudy, and 1 cloudy day in April. The rains are usually heavy. April as well as March, May, July, and October is considered the most uncomfortable time to visit Sapporo.