Brown Island, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Brown Island, Munster, Ireland, is known for its proximity to the scenic Shannon Estuary and the historic Bunratty Castle. The best time to visit Brown Island, Ireland, is during the summer months of 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!