In May, the weather in Hamamatsu is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Hamamatsu has 9 sunny, 8 partly cloudy, 7 rainy, and 7 cloudy days in May. The rains are usually heavy. May as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Hamamatsu.