Loyalist, Canada offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Loyalist, Ontario, Canada, is known for the historic Fairfield House and the scenic Amherst Island. The best time to travel to Loyalist, Canada, is during the summer months of June to August, when the average air temperature is around 70°F (21°C) and the water temperature in nearby lakes is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!