Westhampton Beach, United States offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Westhampton Beach, New York, United States, is known for its beautiful beaches and the Westhampton Beach Performing Arts Center. The best time to travel to Westhampton Beach is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!