Altmunster, Austria offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Altmunster is known for its proximity to Lake Traunsee and the picturesque Schloss Ort. The best time to travel to Altmunster, Austria, is from June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in Lake Traunsee 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!