If you planning to travel to Grand Isle State Park, Grand Isle, Louisiana, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 12:51 PM. The temperature feels like 60.2 with a humidity level of 70 so dress accordingly. Cloud coverage is 13 percent with visibility at 13.9 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling east at a speed of 9 MPH. At the end of the day don’t miss the sunset at 11:07 PM.