Met Éireann has extended a status yellow snow-ice warning to eight counties.
The alert is in place for Dublin, Kildare, Louth, Wicklow, Westmeath, Meath, Cavan and Monaghan until 6.00pm on Wednesday.
The forecaster is warning of snow accumulations of up to 5cm in places.
Meanwhile a weather advisory for the whole country remains in place, with very cold temperatures in low single figures by day - and with sharp or severe frosts and icy patches at night.
There will also be showers of sleet or snow at times in eastern counties, along with hazardous conditions on roads and paths.
Updated Status Yellow Snow/Ice warning issued for Dublin, Kildare, Louth, Wicklow, Westmeath, Meath, Cavan and Monaghan. Valid: 08:00 Tuesday 09/02/2021 to 18:00 Wednesday 10/02/2021. https://t.co/Xg3aMJlyuS pic.twitter.com/l7KpaCaMaN
— Met Éireann (@MetEireann) February 9, 2021
Alan O'Reilly from Carlow Weather told Newstalk Breakfast it is here to stay.
"Certainly a real bite to that wind now - bitterly cold wind chill and continuing very cold through the day, with the easterly wind picking up to even a little bit stronger today than it was yesterday.
"So bringing that wind chill value down - showers also continuing to come in off the Irish Sea".
He said this will mainly affect north Leinster "but making it a little bit further inland, also a little bit further south so you could see some more snow flurries through the day.
"And as I say, feeling absolutely bitterly cold."
Looking at the days ahead, he said there is a "risk of widespread snow on Thursday as that weather system moves in from the south-west".
"Still a little bit uncertain on the exact details, a light covering of snow for many areas though by Thursday night into Friday morning.
"The latest weather models do suggest that it will begin to turn a little bit milder from Friday night into Saturday, but a lot of uncertainty beyond Thursday.
"But still a risk of many areas seeing some lying snow by Friday".