River John, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. River John is known for the annual River John Festival Days and the nearby Seafoam Lavender Farm. The best time to visit River John, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 15-20°C (59-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!