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 2:28 PM. The temperature feels like 19.4 with a humidity level of 81 so dress accordingly. Cloud coverage is 57 percent with visibility at 13 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling south at a speed of 6 MPH. At the end of the day don’t miss the sunset at 11:50 PM.