If you planning to travel to Old Post Office, St Louis, Missouri, 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 12:49 PM. The temperature feels like 39.400000000000006 with a humidity level of 78 so dress accordingly. Cloud coverage is 44 percent with visibility at 12.4 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 9 MPH. At the end of the day don’t miss the sunset at 10:42 PM.