Winchester Bay, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Winchester Bay is known for the Umpqua River Lighthouse and the Oregon Dunes National Recreation Area. The best time to travel to Winchester Bay, United States, is during the summer months of June to August, 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!