If you planning to travel to Watiki Water Park, Rapid City, 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 12:09 PM. The temperature feels like 35.7 with a humidity level of 44 so dress accordingly. Cloud coverage is 21 percent with visibility at 14.9 percent. Today’s UV index is 4, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 21 MPH. At the end of the day don’t miss the sunset at 1:35 AM.