Severn, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Severn, Ontario, Canada, is known for its scenic landscapes and outdoor recreational activities, particularly around the Trent-Severn Waterway. The best time to travel to Severn, Canada, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and water temperature is approximately 15°C (59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!