Hameenlinna, Finland offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hameenlinna is known for the medieval Hame Castle and the Aulanko Nature Reserve. The best time to travel to Hameenlinna, Finland, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and 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!