A weather advisory is currently in place for Cork, remaining in place until tomorrow afternoon.
Met Éireann is urging people to be prepared for a sharp, cold snap with sleet and possibly snow in some parts.
While the worst of the conditions are expected in Ulster and Connacht, Cork is also set to experience a deterioration with rain, sleet, and hail, with some snow on high ground anticipated for today.
There will also be a risk of isolated thunderstorms.
The cold snap is expected to last almost 48 hours, with the weather advisory in place from 6pm yesterday until 3pm tomorrow for the entire country.
Temperatures are expected to dip below freezing tonight.
Showers are forecast to become increasingly isolated tomorrow night, with generally dry conditions on Wednesday.
By midweek, the temperatures will also rise, with lows of 4C to 6C expected.
Motorists have been advised to take extra care on journeys this morning and to expect delays.
Precautionary gritting commenced on a number of Cork roads at 4pm yesterday and again at 1am today.