Mitane, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mitane, Tohoku, Japan, is known for the Shirakami-Sanchi UNESCO World Heritage Site. The best time to travel to Mitane, Japan, is in late spring (May), when the average air temperature is around 18°C (64°F) and the water temperature is approximately 14°C (57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!