Toshima, Japan offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Toshima, Kyushu, Japan, is known for its stunning Sakurajima volcano and the historic Sengan-en Garden. The best time to travel to Toshima, Japan, is from April to June, with average air temperatures around 18-25°C (64-77°F) and water temperatures around 20-23°C (68-73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!