Saint Hilaire de Riez, France offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Saint Hilaire de Riez is known for its Corniche Vendeenne, a scenic coastal road offering stunning views of the Atlantic Ocean. The best time to travel to Saint Hilaire de Riez, France, is from June to September, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-21°C (64-70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!