January in Castellina in Chianti is the cloudiest and the coldest month of the year. In January, the weather in Castellina in Chianti is typically cold. Average daily high temperature in January is about 7 degrees above zero. On average, Castellina in Chianti has 12 partly cloudy, 9 sunny, 6 rainy, and 4 cloudy days in January. The rains are usually light. January as well as February, March, November, and December is considered the most uncomfortable time to visit Castellina in Chianti.