A nationwide status yellow low temperature and ice warning, which came into place at 7pm last night, remains in effect.
Temperatures as low as -5 degrees were recorded in some parts of the country.
The status yellow warning is set to remain in place until 10am this morning.
Snow and ice were seen right across the country over the weekend, with particularly bad snowfall seen in the west.
Met Éireann is forecasting "bitterly cold" conditions early this morning, with snow and ice slow to clear as a result. Freezing fog is also likely.
Bitterly cold & icy start this morning, hazardous conditions on untreated surfaces🥶. Frost, ice & any patches of freezing fog will be slow to clear during the morning. Most of the country will be dry, few rain/hail showers in west Connacht & north Ulster. Highs of 3 to 7C. pic.twitter.com/VTSPhHLG5D— Met Éireann (@MetEireann) January 25, 2021
However, the current cold and wintry spell is expected to come to an end on Tuesday afternoon, when it will give way to much milder and wetter conditions.
Motorists have been reminded that roads may still be icy and treacherous.
It can take up to 10 times longer to stop a vehicle on icy roads, and anyone driving in these conditions has been asked to slow down and keep well back from whoever is in front.