In December, the weather in Kitakyushu is typically warm. Average daily high temperature in December is about 11 degrees above zero. On average, Kitakyushu has 15 rainy, 8 partly cloudy, 5 sunny, and 3 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and July is considered the most uncomfortable time to visit Kitakyushu.