Monmouth Beach, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Monmouth Beach is known for Monmouth Beach Bathing Pavilion and its scenic beachfront along the Jersey Shore. The best time to travel to Monmouth Beach, 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!