Copalis Crossing, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Copalis Crossing, Washington, United States, is known for the Copalis River and its proximity to the unique coastal feature of the Copalis Ghost Forest. The best time to visit Copalis Crossing, United States, is during the summer months of July and August, when the average air temperature is around 65°F (18°C) and the Pacific Ocean 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!