Izena, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Izena, Kyushu, Japan, is known for its historical connection to King Sho En, the first king of the Ryukyu Kingdom. The best time to travel to Izena, Japan, is from April to June, when the average air temperature is around 22°C (72°F) and the water temperature is approximately 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!