Met Éireann has issued a weather warning for today - with high winds causing travel disruption to a number of ferries.
AA Roadwatch is also reporting widespread black ice on the country's roads this morning.
The worst affected areas are Louth, Meath, Westmeath, Kildare, Wicklow, Carlow, Mayo, Sligo, Leitrim and Cork, as well as in north Dublin and around the Dublin / Wicklow Mountains.
Irish ferries have cancelled a number of swift ferries today between Dublin and Holyhead, but other lines are operating as scheduled.
All sailings on the Pembroke to Rosslare route for today have been cancelled.
"The Pembroke to Rosslare route has received the brunt of the weather," said Dermot Merrigan from Irish Ferries.
"We are in contact with our customers with the aim of transferring them to our Dublin to Holyhead route."
Met Eireann has issued a Yellow weather warning for today, with high winds affecting many parts of the country.
An Orange alert for the entire country has been issued for Christmas Eve.
Meanwhile, in England, dozens of alerts are in place for flooding ahead of heavy rain and winds of up to 80 miles per hour.
Forecasters in the UK say the stormy weather will move north and east throughout the morning.
The Met Office has issued a severe weather alert for London, southeast and southwest England, and south Wales.