Sea Girt, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sea Girt, New Jersey, United States, is known for the historic Sea Girt Lighthouse and its picturesque beachfront. The best time to travel to Sea Girt, 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!