If you planning to travel to Merkle Wildlife Sanctuary, Upper Marlboro, Maryland, 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 11:44 AM. The temperature feels like 46.75 with a humidity level of 54 so dress accordingly. Cloud coverage is 5 percent with visibility at 14.9 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling west at a speed of 12 MPH. At the end of the day don’t miss the sunset at 9:54 PM.