Hiranai, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hiranai is known for the Hotokegaura rock formations and the scenic views of Mutsu Bay. The best time to travel to Hiranai, Japan, is in late spring (May), when the average air temperature is around 15°C (59°F) and the water temperature is approximately 10°C (50°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!