If you planning to travel to Frank Day Park, Lewistown, Montana, 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 2:59 PM. The temperature feels like 32.2 with a humidity level of 64 so dress accordingly. Cloud coverage is 79 percent with visibility at 14.9 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 18 MPH. At the end of the day don’t miss the sunset at 11:31 PM.