Oita, Japan offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Oita is known for its hot springs and onsen resorts. The best time to travel to Oita, Japan, is in April when the average air temperature is around 15°C (59°F) and the water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!