A Status Orange low-temperature warning is in place nationwide. The warning came into effect last night and extends to 10am this morning.
Temperatures of -6 were reported in parts of Knock and kiltimagh early this morning.
While no road collisions have been reported, gardai across the region are advising drivers to slow down and take due caution.
Met Éireann say that Wednesday night will again see bitterly cold conditions sweep the country.
AA Roadwatch has urged drivers to take care and to allow more time to reach your destination.
Age Action Ireland has raised concerns for elderly people during the cold snap, as they can fare poorly when the weather takes a turn for the worse.
Justin Moran, of the advocacy group, is urging communities to play their part to ensure that their older neighbours remain safe and well in their homes during the cold conditions.
