Petite Martinique, Grenada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Petite Martinique is known for its traditional boat-building heritage and the annual Whitsuntide Regatta. The best time to travel to Petite Martinique, Grenada, is from December to April, with average air temperatures around 82°F (28°C) and water temperatures near 80°F (27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!