Kin, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kin, Kyushu, Japan, is known for its proximity to the scenic Kin Bay and the historical Kin Kannon Temple. The best time to travel to Kin, Japan, is from April to June, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 22-25°C (72-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!