If you planning to travel to Grand Prismatic Spring, 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 2:58 PM. The temperature feels like 27.150000000000002 with a humidity level of 84 so dress accordingly. Cloud coverage is 70 percent with visibility at 11.6 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 2 MPH. At the end of the day don’t miss the sunset at 11:50 PM.