Hazardous conditions are expected later, with heavy fog on the way.
A nationwide status yellow fog warning will come into effect at 6 o'clock this evening, right the way through until ten o'clock tomorrow morning.
Deirdre Lowe from Met Éireann says visibility will worsen as temperatures fall back below zero this evening.
Met Éireann stated on their website: "Areas of fog will become dense and widespread this evening and linger until Monday morning. The fog will clear eastern and southern counties early Monday morning."
The warning will lead to potentially hazardous travel conditions, with some elements of travel expected to be disrupted.