Kasaoka, Japan offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Kasaoka is known for the Kasaoka Islands, including Kitagi Island, which is famous for its granite quarries and scenic beauty. The best time to travel to Kasaoka, Japan, is in April when the average air temperature is around 15°C (59°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!