October in Sapporo is the rainiest month of the year. In October, the weather in Sapporo is typically warm. Average daily high temperature in October is about 15 degrees above zero. On average, Sapporo has 16 rainy, 9 partly cloudy, and 6 sunny days in October. The rains are usually heavy. October as well as April, November, and December is considered the most uncomfortable time to visit Sapporo.