It's expected to drop to as low as minus three degrees this week.
The cold weather snap is set to return tomorrow night.
Met Éireann is forecasting temperatures dropping as low as minus 3 degrees.
Motorists are being advised to take care on the roads, as widespread frost is expected.
The forecaster says milder weather will return from the middle of next week.
Offaly’s Cathal Nolan, who runs Ireland's Weather Channel, says temperatures are low for this time of year.
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