If you planning to travel to Fort Yellowstone Historic District, Mammoth Hot Springs, 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 2:22 PM. The temperature feels like 16 with a humidity level of 68 so dress accordingly. Cloud coverage is 73 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 13 MPH. At the end of the day don’t miss the sunset at 11:49 PM.