If you planning to travel to Lone Star Geyser, Yellowstone National Park, Wyoming, 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 2:54 PM. The temperature feels like 16.95 with a humidity level of 94 so dress accordingly. Cloud coverage is 70 percent with visibility at 7 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 4 MPH. At the end of the day don’t miss the sunset at 11:46 PM.