Ratnitz, Austria offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ratnitz is known for its proximity to the scenic Lake Worthersee and the historic Hochosterwitz Castle. The best time to travel to Radnitz, Austria, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and water temperature in nearby lakes is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!