Grand Fort Philippe, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Grand Fort Philippe is known for its proximity to the Platier d'Oye Nature Reserve and the historic Fort Philippe. The best time to travel to Grand Fort Philippe, France, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!