Agon Coutainville, France offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Agon Coutainville is known for its picturesque beaches and the Coutainville Lighthouse. The best time to travel to Agon Coutainville, France, is from June to September, with average air temperatures around 60-70°F (15-21°C) and water temperatures around 60-65°F (15-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!