If you planning to travel to Fort Moultrie National Monument, Sullivans Island, South Carolina, 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 11:40 AM. The temperature feels like 70 with a humidity level of 89 so dress accordingly. Cloud coverage is 62 percent with visibility at 9.7 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling east-northeast at a speed of 13 MPH. At the end of the day don’t miss the sunset at 10:25 PM.