South Frontenac, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. South Frontenac is known for Frontenac Provincial Park, a popular destination for hiking and camping. The best time to travel to South Frontenac, 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 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!