Kaminoseki, Japan offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Kaminoseki is known for its scenic Seto Inland Sea views and the Kaminoseki Marine Park. The best time to travel to Kaminoseki, Japan, is in late spring (May), when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!