January in Naha is the coldest month of the year. In January, the weather in Naha is typically warm. Average daily high temperature in January is about 18 degrees above zero. On average, Naha has 19 rainy, 7 cloudy, 4 sunny, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Naha.