A Status Yellow snow and ice warning remains in effect for 11 counties with Met Éireann warning of difficult travelling conditions and poor visibility.
The snow and ice warning for Cork, Kerry, Limerick, Tipperary, Waterford, Donegal, Galway, Leitrim, Mayo, Sligo and Wicklow will be in place until 9am.
A Status Yellow wind warning for counties Clare, Kerry and Galway expired at 6am.
Met Éireann said showers may fall as sleet or snow in some areas, with some accumulations possible, mainly on high ground.
The forecaster said surface water from yesterday’s heavy rain could freeze, leading to icy stretches on untreated roads and footpaths.
Met Éireann forecaster Siobhán Ryan said a change in air mass is already occurring and “the winds have veered westerly in direction”.
“When they begin to veer westerly, we know that that change in air mass has already occurred, so the temperatures … are falling back quite markedly in across the north and west,” she said, and added that the temperature will also fall “quite dramatically” in the coming hours in the south and east.
Ms Ryan said “the temperatures might come in around 0C to [plus] 3C overnight, but it’s going to feel colder, because obviously there’s going to be a wind-chill factor … so that’s going to steer down some sleet and snow showers”.
However, Ms Ryan described the conditions as “routine March weather,” and the temperature would rise a “little bit” over the weekend but “there’s still going to be a little edge on it”.
Ms Ryan said tomorrow would likely be a better day than Sunday, with “long dry spells” tomorrow and the return of a “wind-chill factor” on Sunday.
She added it would remain changeable into next week, and for St Patrick’s Day, “maybe a bit cloudy, not so cold, but probably a spell of rain at some stage”.
Beyond that, “there are tentative signs of high pressure building,” she said.
Ms Ryan said “anything goes” with St Patrick’s Day weather, “it can be dry and sunny, the most you can hope for is temperatures in the high teens at the very, very best”.
“But you can also experience temperatures in the low single figures … and I think for this St Patrick’s Day it’s going to be somewhere in between those,” she added.