Iwaki, Japan offers 18 beaches perfect for sunbathing, surfing, swimming, and more. Iwaki is known for Spa Resort Hawaiians, Aquamarine Fukushima, and Iwaki Coal and Fossil Museum. The best time to travel to Iwaki, Japan, is from late spring to early summer (May to June) when the average air temperature is around 18-22°C (64-72°F) and the water temperature is approximately 16-20°C (61-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!