June in Kingston Upon Thames is the rainiest month of the year. In June, the weather in Kingston Upon Thames is typically warm. Average daily high temperature in June is about 18 degrees above zero. On average, Kingston Upon Thames has 18 rainy, 6 sunny, 3 cloudy, and 3 partly cloudy days in June. The rains are usually moderate. June as well as January, February, March, and November is considered the most uncomfortable time to visit Kingston Upon Thames.