Middletown, United States offers 14 beaches perfect for sunbathing, surfing, swimming, and more. Middletown, Rhode Island, United States, is known for Sachuest Point National Wildlife Refuge and Second Beach. The best time to travel to Middletown, United States, is in late spring (May to June) when the average air temperature is around 65-75°F (18-24°C) and water temperature is approximately 60-70°F (15-21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!