January in Sirmione is the coldest month of the year. In January, the weather in Sirmione is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Sirmione has 12 partly cloudy, 10 sunny, 5 rainy, and 4 cloudy days in January. The rains are usually light. January as well as February, March, April, and May is considered the most uncomfortable time to visit Sirmione.