Thorne Bay, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thorne Bay is known for its proximity to the Tongass National Forest and the Prince of Wales Island's outdoor recreational opportunities. The best time to travel to Thorne Bay, United States, is during the summer months of June to August, when the average air temperature is around 55-65°F and the water temperature is approximately 50-55°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!