Mount Stewart, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Mount Stewart, Prince Edward Island, Canada, is known for the Confederation Trail and its proximity to the scenic Prince Edward Island National Park. The best time to visit Mount Stewart, Canada, is in July when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!