Rosslare Harbour, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Rosslare Harbour is known for its ferry connections to Wales and France. The best time to travel to Rosslare Harbour, Ireland, is from June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 14-16°C (57-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!