May in Nemuro is the rainiest month of the year. In May, the weather in Nemuro is typically cold. Average daily high temperature in May is about 9 degrees above zero. On average, Nemuro has 12 rainy, 8 cloudy, 6 sunny, and 5 partly cloudy days in May. The rains are usually heavy. May as well as March, April, June, and November is considered the most uncomfortable time to visit Nemuro.