Colwyn Bay, United Kingdom offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Colwyn Bay is known for the Welsh Mountain Zoo and the Victorian-era promenade. The best time to travel to Colwyn Bay, United Kingdom, is from June to August, when the average air temperature is around 15-20°C (59-68°F) and the average sea temperature is about 15-17°C (59-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!