Llanelli, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Llanelli is known for the Millennium Coastal Park and the nearby Machynys Peninsula Golf and Country Club. The best time to travel to Llanelli, United Kingdom, is from June to August, with average air temperatures around 18°C (64°F) and water temperatures near 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!