July in Saint-Denis is the sunniest month of the year. In July, the weather in Saint-Denis is typically warm. Average daily high temperature in July is about 22 degrees above zero. On average, Saint-Denis has 25 sunny, 4 rainy, and 2 partly cloudy days in July. The rains are usually light. July as well as June, August, and September is considered the most comfortable time to visit Saint-Denis.