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If you planning to travel to Big Thunder Gold Mine, Keystone, 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 11:10 AM. The temperature feels like 59.4 with a humidity level of 78 so dress accordingly. Cloud coverage is 81 percent with visibility at 11.6 percent. Today’s UV index is 5, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 5 MPH. At the end of the day don’t miss the sunset at 2:39 AM.
