East Mersea, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. East Mersea, England, United Kingdom, is known for Cudmore Grove Country Park and its scenic coastal landscapes. The best time to travel to East Mersea, United Kingdom, is from June to August, when the average air temperature is around 18°C (64°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!