Saint John, Canada offers 18 beaches perfect for sunbathing, surfing, swimming, and more. Saint John is known for the Reversing Falls Rapids and the historic Saint John City Market. The best time to travel to Saint John, Canada, is from June to September, when the average air temperature is around 60-70°F (15-21°C) and the water temperature is approximately 55-65°F (13-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!