Goldach, Switzerland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Goldach, Sankt Gallen, Switzerland, is known for its proximity to Lake Constance and the scenic views of the surrounding Swiss landscape. The best time to travel to Goldach, Switzerland, is from June to August, when the average air temperature is around 20°C (68°F) and the water temperature in Lake Constance is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!