July in La Grande-Motte is the sunniest and the hottest month of the year. In July, the weather in La Grande-Motte is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, La Grande-Motte has 22 sunny, 5 partly cloudy, and 4 rainy days in July. The rains are usually light. July as well as May, June, and September is considered the most comfortable time to visit La Grande-Motte.