Kashio, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kashio, Chubu, Japan, is known for its proximity to the scenic Kiso Valley and the historic Nakasendo Trail. The best time to travel to Kashio, Japan, is in late spring (May), when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!