Tarbert, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tarbert, Scotland, United Kingdom, is known for its picturesque harbor and historic castle ruins. The best time to travel to Tarbert, United Kingdom, is from June to August, when the average air temperature is around 15-18°C (59-64°F) and the water temperature is approximately 13-15°C (55-59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!