Inawashiro, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fort Salonga is known for its proximity to the historic Sunken Meadow State Park and the scenic Long Island Sound. The best time to travel to Inawashiro, Japan, is during late spring (May), when the average air temperature is around 15°C (59°F) and the water temperature is approximately 10°C (50°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!