North Middletown, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. North Middletown, New Jersey, United States, is known for its proximity to Sandy Hook Beach and Gateway National Recreation Area. The best time to travel to North Middletown, United States, 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!