Shoreline, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Shoreline, Washington, United States, is known for its proximity to Richmond Beach Saltwater Park and the Kruckeberg Botanic Garden. The best time to travel to Shoreline, 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 55-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!