Saint Louis du Sud, Haiti offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Saint Louis du Sud is known for the historic Fort des Oliviers and its picturesque coastal scenery. The best time to travel to Saint Louis du Sud, Haiti, is from November to March, with average air temperatures around 77-82°F (25-28°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!