January in Sesto San Giovanni is the coldest month of the year. In January, the weather in Sesto San Giovanni is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Sesto San Giovanni has 13 sunny, 6 rainy, 6 cloudy, and 6 partly cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Sesto San Giovanni.