Reynivellir, Iceland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Reynivellir, East Region, Iceland, is known for its proximity to the stunning Jokulsarlon Glacier Lagoon. The best time to travel to Reynivellir, Iceland, is from June to August, when the average air temperature is around 10-15°C (50-59°F) and the water temperature is approximately 7-10°C (45-50°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!