If you planning to travel to Ameristar Casino St. Charles, St. Charles, 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 1:18 PM. The temperature feels like 41.150000000000006 with a humidity level of 80 so dress accordingly. Cloud coverage is 87 percent with visibility at 12.3 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling east-northeast at a speed of 4 MPH. At the end of the day don’t miss the sunset at 10:45 PM.