Grand Popo, Benin offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Grand Popo is known for its beautiful beaches, the Mono River, and the Grand Popo Lagoon. The best time to travel to Grand Popo, Benin, is from November to February, with average air temperatures around 28°C (82°F) and water temperatures near 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!