Geddes, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Geddes, South Dakota, United States, is known for its proximity to the Missouri River and the nearby Lake Andes National Wildlife Refuge. The best time to travel to Geddes, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in nearby lakes is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!