Mary Esther, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Mary Esther is known for its proximity to the beautiful beaches of the Emerald Coast and the nearby Gulf Islands National Seashore. The best time to travel to Mary Esther, United States, is in April when the average air temperature is around 70°F (21°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!