Leppalahti, Finland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Leppalahti, Southwest Finland, Finland, is known for its proximity to the Archipelago Sea and the Turku Archipelago. The best time to travel to Leppalahti, Finland, 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 is approximately 15-18°C (59-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!