Gruissan, France offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Gruissan is known for its iconic Tour Barberousse, the scenic Gruissan Plage, and the nearby Narbonnaise en Mediterranee Natural Regional Park. The best time to travel to Gruissan, France, is from June to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!