Cully, Switzerland offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Cully, Vaud, Switzerland, is known for the Cully Jazz Festival. The best time to travel to Cully, Switzerland, 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 of Lake Geneva is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!