In March, the weather in Romans-sur-Isere is typically cold. Average daily high temperature in March is about 10 degrees above zero. On average, Romans-sur-Isere has 11 rainy, 9 sunny, 9 partly cloudy, and 2 cloudy days in March. The rains are usually moderate. March as well as January, February, November, and December is considered the most uncomfortable time to visit Romans-sur-Isere.