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 10:42 AM. The temperature feels like 78.30000000000001 with a humidity level of 58 so dress accordingly. Cloud coverage is 7 percent with visibility at 14.3 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 4 MPH. At the end of the day don’t miss the sunset at 1:30 AM.