Brienz, Switzerland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Brienz is known for Lake Brienz, the Brienz Rothorn Railway, and the Ballenberg Open-Air Museum. The best time to travel to Brienz, Switzerland, is from June to September, when the average air temperature is around 15-25°C (59-77°F) and the water temperature in Lake Brienz is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!