Seltjarnarnesbar, Iceland offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Seltjarnarnesbar is known for the Grotta Lighthouse and its surrounding nature reserve, which is popular for birdwatching and viewing the Northern Lights. The best time to travel to Seltjarnarnesbar, 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 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!