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 1:57 PM. The temperature feels like 20.4 with a humidity level of 76 so dress accordingly. Cloud coverage is 65 percent with visibility at 11 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 10 MPH. At the end of the day don’t miss the sunset at 11:18 PM.