The best time to visit Shelter Island is during the summer months, from June to August, when the weather is warm and all the island's amenities are in full swing.For those seeking a classic summer holiday experience, July and August offer the warmest temperatures, superb for enjoying the beaches and water activities. You'll find all the restaurants and shops open, and there's a lively, yet relaxed, atmosphere across the island. This period is ideal for families and couples looking for a traditional seaside escape with plenty of sunshine.If you prefer a slightly quieter visit with pleasant weather and fewer crowds, late May and early June, or early September, are also excellent choices. The weather is still lovely, most establishments are open, and you can experience the island's natural beauty with a bit more tranquility.