West Portsmouth, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. West Portsmouth, Ohio, United States, is known for its proximity to Shawnee State Park and the Ohio River. The best time to travel to West Portsmouth, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the nearby Ohio River water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!