South Bay, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. South Bay is known for its proximity to Manitoulin Island, the world's largest freshwater island. The best time to travel to South Bay, Canada, is during the summer months of June to August, when the average air temperature is around 70°F (21°C) and the water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!