Thonglabakki, Iceland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thonglabakki, Northeastern Region, Iceland, is known for its proximity to the stunning natural landscapes of Vatnajokull National Park and the geothermal wonders of Lake Myvatn. The best time to travel to Thonglabakki, Iceland, is during the summer months of June to August, when the average air temperature is around 10-15°C (50-59°F) and the water temperature is approximately 8-12°C (46-54°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!