Hard, Austria offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hard is known for Lake Constance and the Rhine Delta Nature Reserve. The best time to travel to Hard, Austria, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in Lake Constance is approximately 20-22°C (68-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!