Gletterens, Switzerland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gletterens is known for the Prehistoric Park, which offers interactive experiences and reconstructions of life during the Neolithic period. The best time to travel to Gletterens, 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 in Lake Neuchatel 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!