Colchester, United Kingdom offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Colchester is known for Colchester Castle, the largest Norman keep in Europe and a popular tourist attraction. The best time to travel to Colchester, United Kingdom, is from June to August, with average air temperatures around 18-22°C (64-72°F) and water temperatures around 15-18°C (59-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!