January in Nanjing is the coldest month of the year. In January, the weather in Nanjing is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Nanjing has 13 sunny, 8 partly cloudy, 6 rainy, and 4 cloudy days in January. The rains are usually moderate. January as well as February, July, and August is considered the most uncomfortable time to visit Nanjing.