If you planning to travel to Postal Museum, Charleston, 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 10:47 AM. The temperature feels like 79.95 with a humidity level of 79 so dress accordingly. Cloud coverage is 23 percent with visibility at 11.9 percent. Today’s UV index is 9, don’t forget the sunscreen if you need it! Today’s winds are traveling northeast at a speed of 12 MPH. At the end of the day don’t miss the sunset at 11:56 PM.