January in Shirahama is the snowiest, the windiest, the sunniest, and the coldest month of the year. In January, the weather in Shirahama is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Shirahama has 14 sunny, 11 partly cloudy, 2 rainy, 2 snowy, and 2 cloudy days in January. The rains are usually light. January as well as February, March, April, and May is considered the most uncomfortable time to visit Shirahama.