January in Kingston Upon Thames is the coldest month of the year. In January, the weather in Kingston Upon Thames is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Kingston Upon Thames has 16 rainy, 9 cloudy, 5 sunny, and 1 partly cloudy day in January. The rains are usually moderate. January as well as February, March, June, and November is considered the most uncomfortable time to visit Kingston Upon Thames.