Westerly, United States offers 21 beaches perfect for sunbathing, surfing, swimming, and more. Westerly is known for Misquamicut State Beach and Watch Hill Lighthouse. The best time to travel to Westerly, 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!