Cacouna, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cacouna is known for the Cacouna Lighthouse and its scenic views of the St. Lawrence River. The best time to travel to Cacouna, Canada, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 12°C (54°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!