Napier Township, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Napier Township, Pennsylvania, United States, is known for Shawnee State Park. The best time to travel to Napier Township, United States, is in late spring (May to June) when the average air temperature is around 65-75°F and water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!