Lohja, Finland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lohja is known for the Tytyri Mine Museum and Lohja Lake. The best time to travel to Lohja, 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 in lakes 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!