Iwakuni, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Iwakuni is known for the iconic Kintai Bridge and the historic Iwakuni Castle. The best time to travel to Iwakuni, 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!