Grenville, Grenada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Grenville, Saint Andrew, Grenada, is known for the Grenville Market and the nearby Grand Etang National Park. The best time to travel to Grenville, Grenada, is from December to April, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!