Sarteneja, Belize offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sarteneja, Corozal, Belize, is known for its proximity to the Shipstern Nature Reserve and its traditional boat-building industry. The best time to travel to Sarteneja, Belize, is from December to April, with average air temperatures around 75-85°F (24-29°C) and water temperatures about 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!