A Status Yellow snow and ice warning has been issued for 18 counties.
A Met Éireann warning comes into force from midnight tonight until noon tomorrow.
It includes Carlow, Kildare, Kilkenny, Laois, Wexford, Wicklow, Offaly, Donegal, Leitrim, Sligo, Cork, Tipperary and Waterford.
The forecaster said there is a risk of snow accumulations at lower levels.
Status Yellow - Snow/Ice warning for Carlow, Kildare, Kilkenny, Laois, Wexford, Wicklow, Offaly, Donegal, Leitrim, Sligo, Cork, Tipperary and Waterford
Risk of snow accumulations to lower levels.
Valid: 00:00 30/12/2020 to 12:00 Wednesday 30/12/2020https://t.co/MkgbhJDOYh pic.twitter.com/fSxKbCj3Zx
— Met Éireann (@MetEireann) December 29, 2020
Meanwhile, a UK Met Office yellow warning comes into force for Antrim, Armagh, Fermanagh, Tyrone and Derry from 3pm this afternoon.
The forecaster said snow and ice may bring some disruption up until midnight on Wednesday.
Snow
Met Éireann meteorologist Joanna Donnelly told Newstalk that things will be especially cold in Donegal, Leitrim and Sligo with the potential for snow accumulations at lower levels.
“In addition to that, we have got a spell of rain, sleet and snow moving in from the west and that is going to go across the country overnight tonight and through the early parts of tomorrow,” she said.
“That is what is going to lead to the potential for some accumulations there in southern parts of Leinster and eastern parts of Munster.”
"Really cold"
Ms Donnelly said there is “always the risk” that the showers could leak down further into counties that are not facing yellow warnings.
“There is the potential for a light dusting but it is unlikely to amount to very much,” she said.
She said it is going to remain “really cold” for the rest of the week.
“In fact, temperatures on Wednesday across the country are unlikely to rise above maybe 1C or 2C through the afternoon and when temperatures are that low, there is always the risk of some wintery precipitation,” she said.
“Through the weekend period, it is staying on the really cold side and we have really cold and frosty nights so, with those low temperatures, any precipitation could always turn wintery, especially over hills and mountains and even, at times, down to low levels.”
