Hay River, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hay River is known for the Great Slave Lake, Hay River Heritage Centre, and the annual Hay Days Festival. The best time to travel to Hay River, Canada, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature in Great Slave Lake is approximately 10-15°C (50-59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!