Tohmajarvi, Finland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tohmajarvi is known for its proximity to the beautiful Lake Pielinen and the Koli National Park. The best time to travel to Tohmajarvi, 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 15-18°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!