January in Shanghai is the coldest month of the year. In January, the weather in Shanghai is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Shanghai has 10 sunny, 8 rainy, 8 partly cloudy, and 5 cloudy days in January. The rains are usually moderate. January as well as February, March, June, and July is considered the most uncomfortable time to visit Shanghai.