Bay Center, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Bay Center, Washington, United States, is known for the Willapa National Wildlife Refuge and its proximity to the scenic Willapa Bay. The best time to travel to Bay Center, United States, is in July when the average air temperature is around 65°F (18°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!