Clinton, United States offers 12 beaches perfect for sunbathing, surfing, swimming, and more. Clinton, Washington, United States, is known for the Clinton Ferry Terminal, which serves as a gateway to Whidbey Island. The best time to travel to Clinton, United States, is in late spring (May), 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!