Sumoto, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sumoto, Kansai, Japan, is known for Awaji Yumebutai, a complex designed by architect Tadao Ando. The best time to travel to Sumoto, Japan, is from late March to May, with average air temperatures around 15-20°C (59-68°F) and water temperatures around 15-18°C (59-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!