Mandelieu la Napoule, France offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Mandelieu la Napoule is known for the Chateau de la Napoule and its scenic views of the Mediterranean Sea. The best time to travel to Mandelieu-la-Napoule, France, is from May 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!