Sylvan Grove, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sylvan Grove, Kansas, United States, is known for Wilson Lake, a popular destination for outdoor recreation and water activities. The best time to travel to Sylvan Grove, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the nearby Wilson Lake water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!