Swan's Island, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Swan's Island is known for the Burnt Coat Harbor Light Station and the Swan's Island Lobster and Marine Museum. The best time to travel to Swan's Island, United States, is during the summer months of June to August, when the average air temperature is around 70°F (21°C) and the water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!