Okoppe, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Okoppe, Hokkaido, Japan, is known for the Okoppe Milk Village and its dairy products. The best time to travel to Okoppe, Japan, is in August when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!