The National Emergency Co-ordination Group will meet in Dublin this morning to assess the impact of the cold snap.
Met Éireann has again issued a warning that pockets of freezing fog may cause hazardous conditions for road users.
Temperatures in Donegal could reach as low as -6 degrees tonight (Sun).
Snow is forecast to fall in Dublin, Kildare and Wicklow.
This and another widespread Yellow warning about low temperature and ice will remain in place throughout the morning.
However, an Orange warning for low temperature and ice will be in place from 5pm until midday tomorrow with temperatures forecast to dip in some places to a numbing -7C.