Kozmodemyansk, Russia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kozmodemyansk is known for the Ethnographic Open-Air Museum of the Mari People. The best time to travel to Kozmodemyansk, Russia, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the Volga River 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!