Ascona, Switzerland offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Ascona is known for its picturesque Lake Maggiore, the Monte Verita cultural site, and the annual Ascona Jazz Festival. The best time to travel to Ascona, Switzerland, is from June to September, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in Lake Maggiore 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!