Iheya, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Iheya, Kyushu, Japan, is known for Iheya Island, which offers beautiful beaches, traditional Okinawan culture, and the historic site of the tomb of King Sho En. The best time to travel to Iheya, Japan, is from April to June, with average air temperatures around 20-25°C (68-77°F) and water temperatures approximately 22-25°C (72-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!