Lowell, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Lowell is known for the Lowell National Historical Park, which highlights its significant role in the American Industrial Revolution. The best time to travel to Lowell, United States, is in late spring (May to June) when the average air temperature is around 60-70°F, and the Merrimack River water temperature is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!