January in Kofu is the sunniest and the coldest month of the year. In January, the weather in Kofu is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Kofu has 16 sunny, 8 rainy, and 7 partly cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Kofu.