Harveys Lake, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Harveys Lake is known for Harveys Lake, the largest natural lake by volume in Pennsylvania, which attracts tourists for boating, fishing, and scenic views. The best time to travel to Harveys Lake, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!