Walloon Lake, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sussex Inlet is known for its proximity to the stunning Jervis Bay and the Conjola National Park. The best time to travel to Walloon Lake, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature is approximately 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!