Gaienhofen, Switzerland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gaienhofen, Baden Wurttemberg, Switzerland, is known for the Hermann Hesse Museum dedicated to the famous writer Hermann Hesse. The best time to travel to Gaienhofen, Switzerland, is from June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in Lake Constance 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!