Southold, United States offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Southold is known for its picturesque vineyards, such as Croteaux Vineyards, and historic sites like Horton Point Lighthouse. The best time to travel to Southold, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 60°F to 80°F and the water temperature is around 60°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!