Fort Royal, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fort Royal, Ulster, Ireland, is known for its historical significance and scenic views. The best time to travel to Fort Royal, Ireland, is from June to August, when the average air temperature is around 60-65°F (15-18°C) and the water temperature is approximately 55-60°F (13-16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!