Your morning Iowa weather update Widespread frost advisories are in effect across Iowa this Thursday morning, with temperatures dipping into the lower 30s in many locations. If you haven't already covered those tender plants or brought in potted flowers, you'll want to do that right away as frost formation is likely through 7 A.M. This morning starts off chilly with temperatures around 41 degrees in Des Moines, but we'll see steady warming through the day.