Widewater Beach, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Widewater Beach, Virginia, United States, is known for Widewater State Park and its scenic views of the Potomac River. The best time to visit Widewater Beach, United States, is during the summer months of June to August, when the average air temperature is around 85°F (29°C) and the water temperature is approximately 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!