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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 11:40 AM. The temperature feels like 45.7 with a humidity level of 43 so dress accordingly. Cloud coverage is 55 percent with visibility at 14.9 percent. Today’s UV index is 3, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 10 MPH. At the end of the day don’t miss the sunset at 2:01 AM.
