If you planning to travel to Old Idaho Penitentiary, Boise, Idaho, 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 2:21 PM. The temperature feels like 44.35 with a humidity level of 87 so dress accordingly. Cloud coverage is 78 percent with visibility at 10.6 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 5 MPH. At the end of the day don’t miss the sunset at 12:33 AM.