Jokulsarlon, Iceland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Jokulsarlon is known for its stunning glacial lagoon and the nearby Diamond Beach. The best time to visit Jokulsarlon, Iceland, is from June to August, when the average air temperature is around 10°C (50°F) and the water temperature is approximately 1°C (34°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!