Northeastern Manitoulin and the Islands, Canada offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Northeastern Manitoulin and the Islands is known for Manitoulin Island, the world's largest freshwater island, and the Cup and Saucer Trail. The best time to travel to Northeastern Manitoulin and the Islands, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 15-20°C (59-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!