Wakayama, Japan offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Wakayama is known for Wakayama Castle, Koyasan, and Adventure World. The best time to travel to Wakayama, Japan, is in April when the average air temperature is around 15°C (59°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!