Saint Peters Bay, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Peters Bay is known for the Greenwich Prince Edward Island National Park and the Confederation Trail. The best time to travel to Saint Peters Bay, Canada, is during the summer months of July and August, 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!