Longueuil, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Longueuil is known for the Parc Michel-Chartrand and its proximity to Montreal. The best time to travel to Longueuil, Canada, is from 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!