Topsfield, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Topsfield, Massachusetts, United States, is known for the Topsfield Fair, the country's oldest continuously operating agricultural fair. The best time to travel to Topsfield, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and 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!