Summerside, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Summerside is known for the College of Piping and Celtic Performing Arts of Canada. The best time to travel to Summerside, Canada, is from June to September, when the average air temperature is around 15-22°C (59-72°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!