July in Saint-Denis is the windiest and the coldest month of the year. In July, the weather in Saint-Denis is typically warm. Average daily high temperature in July is about 19 degrees above zero. On average, Saint-Denis has 18 sunny, 7 rainy, and 6 partly cloudy days in July. The rains are usually light. July as well as June and October is considered the most comfortable time to visit Saint-Denis.