Newton, United States offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Newton, Massachusetts, United States, is known for its historic homes and beautiful parks. The best time to travel to Newton, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!