In April, the weather in Shizuoka is typically warm. Average daily high temperature in April is about 15 degrees above zero. On average, Shizuoka has 13 rainy, 8 sunny, 7 partly cloudy, and 2 cloudy days in April. The rains are usually heavy. April as well as February, March, June, and July is considered the most uncomfortable time to visit Shizuoka.