Mattapoisett, United States offers 21 beaches perfect for sunbathing, surfing, swimming, and more. Mattapoisett is known for Ned's Point Lighthouse and its charming New England coastal scenery. The best time to travel to Mattapoisett, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!