Deer Island, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Deer Island is known for its scenic beauty and the Old Sow, the largest tidal whirlpool in the Western Hemisphere. The best time to travel to Deer Island, 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!