East Lyme, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. East Lyme is known for Rocky Neck State Park and Niantic Bay Boardwalk. The best time to travel to East Lyme, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!