Haverhill, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Haverhill is known for its historic Winnekenni Castle and the Buttonwoods Museum. The best time to travel to Haverhill, 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!