Carlyle, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Carlyle, Illinois, United States, is known for Carlyle Lake, the largest man-made lake in Illinois, which is a popular destination for boating, fishing, and camping. The best time to travel to Carlyle, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!