Coos Bay, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Coos Bay is known for the Oregon Dunes National Recreation Area and the Cape Arago Lighthouse. The best time to travel to Coos Bay, United States, is from June to September, when the average air temperature is around 65-70°F and the water temperature is approximately 55-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!