Okayama, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Okayama is known for Korakuen Garden and Okayama Castle. The best time to visit Okayama, 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!