Waltham, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Waltham, Massachusetts, United States, is known for Brandeis University and the Charles River Museum of Industry and Innovation. The best time to travel to Waltham, United States, is during late spring (May to June) when the average air temperature is around 60-70°F and water temperature is approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!