Keansburg, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Keansburg is known for Keansburg Amusement Park and Runaway Rapids Waterpark. The best time to travel to Keansburg, United States, is during the summer months of June to August, when the average air temperature is around 75-85°F and the water temperature is approximately 70-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!