Gosau, Austria offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gosau, Upper Austria, Austria, is known for the stunning Gosauseen lakes and the Dachstein West ski region. The best time to travel to Gosau, Austria, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature in nearby lakes 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!