A new Status Orange freezing fog warning has been issued for 21 counties, Cork not being included.
Met Eireann is forecasting dense freezing fog this afternoon, and into the evening, leading to very hazardous driving conditions.
A Status Yellow low temperature/ice warning remains in place for the whole country.
The National Emergency Co-ordination Group have left it up to individual schools to decide on telling students to stay at home or not.
Paul Crone, director of the National Association of Principals and Deputy Principals, says decisions will be made locally.
