July in Marseilles is the sunniest and the hottest month of the year. In July, the weather in Marseilles is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Marseilles has 24 sunny, 4 partly cloudy, and 3 rainy days in July. The rains are usually light. July as well as May, June, August, and September is considered the most comfortable time to visit Marseilles.