Arch Cape, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Arch Cape, Oregon, United States, is known for its proximity to the scenic Haystack Rock and the picturesque Oswald West State Park. The best time to visit Arch Cape, United States, is during the summer months of July and August, when the average air temperature is around 65°F (18°C) and the 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!