Slidell, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Slidell is known for the Honey Island Swamp, a popular destination for eco-tours and wildlife viewing. The best time to travel to Slidell, United States, is in the spring (March to May) when the average air temperature is around 70-80°F and the water temperature is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!