Met Éireann has warned that temperatures could drop to -3C in some areas around the country tonight, with more freezing conditions also expected tomorrow.
Speaking to RTÉ's Drivetime, Meteorologist Joanna Donnelly said: "Tomorrow's going to be really cold as well, at times temperatures barely getting above freezing in places, particularly where there's going to be any snow lying."
Ms Donnelly said that Thursday will still be cold, "but there's a little bit of a bump coming after that".
She said temperatures will begin to increase after Thursday, which will bring rain.
Weather warnings are currently in place across different counties.
A Status Yellow snow and ice warning is in place for counties Donegal, Leitrim, Sligo until 9am tomorrow.
Met Éireann says snow showers will lead to some accumulations and there will be icy stretches too.
Snow/Ice warning has been issued for #Carlow, #Kildare, #Kilkenny, #Laois & #Tipperary— Met Éireann (@MetEireann) January 17, 2023
Scattered sleet & snow showers with some accumulations possible
Icy stretches likely ❄️
Hazardous driving conditions ⚠️
Valid: 17/01,23:28 - 18/01,09:00
More here 👇https://t.co/Xg3aMJlyuS pic.twitter.com/khNacoCISH
A separate Status Yellow snow and ice warning is also in place for counties Cavan, Monaghan, Clare, Cork, Kerry, Limerick, Galway, Mayo, Roscommon, Meath, Offaly, Tipperary, Carlow, Kildare, Kilkenny, Laois, Longford, Louth and Westmeath until 9am tomorrow.
Met Éireann says there will be scattered sleet and snow showers with some accumulations possible and with icy stretches likely too.
In Northern Ireland, the Met Office has a Status Yellow snow and ice warning in place for Antrim, Armagh, Down, Fermanagh, Tyrone and Derry until noon tomorrow. Snow showers and icy stretches, which may cause some disruption, are forecast there.
We need your consent to load this rte-player contentWe use rte-player to manage extra content that can set cookies on your device and collect data about your activity. Please review their details and accept them to load the content.Manage Preferences
Speaking on RTÉ's Morning Ireland, Met Éireann meteorologist Gerry Murphy said tonight will not be quite as cold as last night, "but nonetheless it will still be cold enough for a widespread frost".
The cold spell will last until the end of Thursday and into Friday, he said, "so we have another very cold day in store for tomorrow".
"Possibly not just quite as cold - temperatures between 2 and 5 again - further wintry showers pushing down over the country, but not quite as many later on, and then very cold tomorrow night once again.
"And then also on Thursday, another very cold day."
By Friday temperatures should not be as low, as there will be milder air along with rain, he said.
Mr Murphy explained that "in the short-term the weather over Ireland can be very much determined on where the air is coming from.
"Really the set-up at the moment is that we have returned to this colder Arctic air which is associated with depressions over to the northeast and so that Arctic air is coming down over us once again.
"And it's not as cold and as dry as previously, there's actually more moisture in it, which means that we're getting more showers - more wintry showers, especially in the west and north."
Additional reporting Jennie O'Sullivan, Eileen Magnier