Saint Charles Borromee, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Saint Charles Borromee is known for the Parc Saint-Jean-Bosco and its proximity to the scenic L'Assomption River. The best time to travel to Saint Charles Borromee, 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 64°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!