Harrison Township, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Harrison Township is known for Lake St. Clair Metropark, a popular destination for boating, fishing, and outdoor recreation. The best time to travel to Harrison Township, 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 in Lake St. Clair 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!