If you planning to travel to Royal River Casino, Flandreau, South 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 10:53 AM. The temperature feels like 71 with a humidity level of 72 so dress accordingly. Cloud coverage is 6 percent with visibility at 12.3 percent. Today’s UV index is 9, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southeast at a speed of 5 MPH. At the end of the day don’t miss the sunset at 2:08 AM.