Portneuf sur Mer, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Portneuf sur Mer is known for the Portneuf Sandbank, a popular destination for birdwatching and exploring unique coastal ecosystems. The best time to travel to Portneuf-sur-Mer, Canada, is during the summer months of June to August, when the average air temperature is around 68°F (20°C) and the water temperature is approximately 59°F (15°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!