January in Sassari is the windiest and the cloudiest month of the year. In January, the weather in Sassari is typically warm. Average daily high temperature in January is about 12 degrees above zero. On average, Sassari has 10 rainy, 10 sunny, 10 partly cloudy, and 1 cloudy day in January. The rains are usually moderate. January as well as February is considered the most uncomfortable time to visit Sassari.