Mahwah, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mahwah, New Jersey, United States, is known for its scenic parks and outdoor recreational opportunities, particularly in the Ramapo Valley County Reservation. The best time to travel to Mahwah, United States, is in late spring (May to June) when the average air temperature is around 65-75°F, but there are no significant bodies of water for swimming. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!