Hot and humid in the summer. Wetsuit in the winter time when cold air from the fronts blow through. Water temps varies with the seasons. Very warm in the summer and cools off to wetsuit temperatures in winter.
From New Orleans take the 90 to the southwest. Then take 1 south to Golden Meadow and Port Fourchon. Keep driving on 1 until you get onto Grand Isle. One access is right in the beginning of the island, when you drive onto it. Exit 1 before it curves to the left, and keep driving straight into Burnette. At the end of the road you can park.