Manlius, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Manlius, New York, United States, is known for the Stickley Museum, showcasing the history of the iconic Stickley furniture. The best time to travel to Manlius, United States, is in late spring (May to June) when the average air temperature is around 60-70°F, and water temperatures in nearby lakes are approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!