Big Grass Island, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Big Grass Island, Florida, United States, is known for the Big Grass Island Wildlife Refuge. The best time to visit Big Grass Island, United States, is during the summer months of June to August, when the average air temperature is around 70-75°F and the water temperature is approximately 65-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!
