May in Marseilles is the cloudiest month of the year. In May, the weather in Marseilles is typically warm. Average daily high temperature in May is about 22 degrees above zero. On average, Marseilles has 13 sunny, 8 partly cloudy, 7 rainy, and 3 cloudy days in May. The rains are usually moderate. May as well as June, July, August, and September is considered the most comfortable time to visit Marseilles.