Copalis Beach, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Copalis Beach is known for the Copalis River, Griffiths-Priday State Park, and the unique experience of clam digging on its beaches. The best time to visit Copalis Beach is during the summer months of July and August, 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!