Malahide, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Malahide is known for Malahide Castle and Gardens. The best time to travel to Malahide, Ireland, is from June to August, with average air temperatures around 60-70°F (15-21°C) and water temperatures around 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!