Hampstead, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Hampstead, New Hampshire, United States, is known for the historic Hampstead Meeting House and the scenic views of Island Pond. The best time to travel to Hampstead, United States, is in late spring (May to June) when the average air temperature is around 70-80°F and the water temperature is approximately 65-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!