Dunai, Russia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Dunai, Primorsky Krai, Russia, is known for its proximity to the Sikhote-Alin Biosphere Reserve. The best time to travel to Dunai, Russia, is during the summer months of June to August, when the average air temperature is around 60-70°F (15-21°C) and the water temperature is approximately 50-60°F (10-16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!