Mindemoya, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mindemoya is known for Lake Mindemoya and the nearby Treasure Island, which is the largest island in a lake on an island in a lake in the world. The best time to travel to Mindemoya, Canada, is in July, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!