In March, the weather in Romans-sur-Isere is typically warm. Average daily high temperature in March is about 12 degrees above zero. On average, Romans-sur-Isere has 11 rainy, 10 sunny, 6 partly cloudy, and 4 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.