Shelter Bay, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Shelter Bay, Washington, United States, is known for its proximity to Deception Pass State Park and the Swinomish Indian Tribal Community. The best time to travel to Shelter Bay, United States, is during the summer months of June to August, when the average air temperature is around 70-75°F and the water temperature is approximately 60-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!