If you planning to travel to Old Post Office, Grassy Butte, North Dakota, 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 2:08 PM. The temperature feels like 8.3 with a humidity level of 95 so dress accordingly. Cloud coverage is 84 percent with visibility at 5.4 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling east-southeast at a speed of 13 MPH. At the end of the day don’t miss the sunset at 11:07 PM.