Saint Rosaire, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Rosaire, Quebec, Canada, is known for its picturesque rural landscapes and outdoor recreational activities. The best time to travel to Saint Rosaire, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and water temperature is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!