Tsushima, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tsushima is known for Tsushima Island, Tsushima Wildlife Conservation Center, and Watatsumi Shrine. The best time to travel to Tsushima, Japan, is from late spring to early summer (May to June) when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!