Dunbar, United Kingdom offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Dunbar, Scotland, United Kingdom, is known for its picturesque coastal scenery and historic Dunbar Castle ruins. The best time to travel to Dunbar, United Kingdom, is from June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 12-15°C (54-59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!