Île-D'Aix, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ile-D'Aix is known for Fort Boyard and the Napoleon Museum. The best time to travel to Ile-D'Aix, France, is from June to September, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!