Gilgo Oak Beach Captree, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gilgo Oak Beach Captree, New York, United States, is known for the Fire Island Lighthouse and Robert Moses State Park. The best time to travel to Gilgo Oak Beach Captree, 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!