June in Shanghai is the rainiest and the cloudiest month of the year. In June, the weather in Shanghai is typically warm. Average daily high temperature in June is about 25 degrees above zero. On average, Shanghai has 20 rainy, 4 partly cloudy, 3 sunny, and 3 cloudy days in June. The rains are usually heavy. June as well as January, July, and August is considered the most uncomfortable time to visit Shanghai.