January in Roma is the cloudiest and the hottest month of the year. In January, the weather in Roma is typically hot. Average daily high temperature in January is about 33 degrees above zero. On average, Roma has 13 sunny, 7 rainy, 7 partly cloudy, and 4 cloudy days in January. The rains are usually heavy. January as well as February, November, and December is considered the most uncomfortable time to visit Roma.