People have been warned to expect disruption after the Met Office issued a fresh alert for snow and ice across Northern Ireland.
Up to 10cm of snow is possible in some places, the forecaster said.
A yellow weather warning takes effect from 9pm tonight, and will last until 6pm tomorrow evening.
The disruption is expected just as most schools and many workplaces are set to return from Monday.
Already today, sport is affected with four Irish Cup ties off.
The latest weather warning covers all six Northern Ireland counties.
The Met Office said: “Spells of rain, sleet and snow will develop from the south late on Saturday before clearing through Sunday.
“Coastal areas will likely see rain, but inland and over higher ground, sleet and snow is more likely.
“Locally 1-3 cm of snow is possible away from coasts, with 5-10 cm possible over the Mournes, Sperrins and Antrim Hills.
“Ice will be an additional hazard, especially on untreated surfaces.”
Larger snowfall is expected at higher grounds
The Met Office said there is likely to be disruption to transport and some infrastructure.
It added that some roads and railways are likely to be affected with longer journey times by road, bus and train services.
There is also a warning of some icy patches on untreated roads, pavements and cycle paths, and the risk of injuries from slips and falls on icy surfaces.
A yellow warning had already been in place from 4pm yesterday until 10am today, stretching across counties Antrim, Down, Londonderry and Tyrone.
Several sports fixtures have been affected that the cold snap.
The Glenavon v Dundela; Belfast Celtic v Moyola; Dollingstown v Ballyclare and Institute v Loughgall ties were called off.
But the Dungannon Swifts v Rathfriland and Ballymacash Rangers v Ballinamllard ties go ahead after 11am pitch inspections, as does Bangor v Newington.
The Knockbreda v Crusaders tie has been switched to the Crues’ Seaview ground with a 2pm kick-off.
In GAA, the All-Ireland Senior Club Championship tie between Dr Crokes and Errigal Ciaran was postponed. It will be played next Saturday, January 11.
Speaking to the Belfast Telegraph on Friday, a spokesperson from the Met Office said: “The low pressure on Saturday is likely to bring some snow in Northern Ireland. The main focus will be on the mainland UK but there will certainly be some in Northern Ireland.
“The higher ground will be more affected with the mountains in the south east likely to see the most snow accumulation … More widely there will be more of a sleet and snow mix falling through Saturday night and the early hours of Sunday.”
Temperatures on Saturday will range between 1C and 3C, reaching near freezing in the east and bringing an assortment of snow, sleet and ice with it.
Heading into Sunday, the potential for wintery showers will continue, with the rain, sleet and snow stretching to the north of the country and maximum temperatures remaining in just the low single figures.
Temperatures plummet to minus 5C overnight as cold snap continues to grip UK
With schools starting on Monday, the Met Office has cautioned commuters of a “fairly considerable ice risk” in place, with a particular focus on rural areas.
They advised those travelling to give themselves extra time due to the more hazardous conditions.
Throughout Monday, icy surfaces are expected to subside as sunny spells break out later in the morning.
Temperatures will remain in the low single figures, reaching highs of around 3C.
Altnaheglish reservoir
A spokesperson from the Met Office added: “With the sleet or snow falling through Sunday, it does mean surfaces will be quite wet going into Sunday night and Monday and temperatures are expected to drop then. A drop of perhaps -2C and -3C is expected in rural parts so there could be a fairly considerable ice risk.
“It could be a little more dangerous, so I would advise to give people a bit of extra time given the wintery nature of the weather that’s around at the moment.
“Monday itself will see some spells of sunshine, so hopefully it will thaw away into the morning although around travelling to work and school times it could still be below freezing so do take care when travelling then.”
Elsewhere in the UK, an amber warning for snow and freezing rain covering most of Wales and central England, including the Midlands and the north-west cities of Liverpool and Manchester, is in place from 6pm on Saturday to midday on Sunday, the Met Office said.
The cold weather is also causing disruption in the Irish Republic, with a “multi-hazard weather event” due to hit the country later on Saturday.
A series of weather warnings will come into effect, with status orange snow and ice warnings issued for Carlow, Kilkenny, Laois, Offaly, Wicklow, Clare, Limerick and Tipperary.
These warnings will be in effect from 5pm on Saturday until 5pm on Sunday.
A separate rain and snow warning has been issued for Cork, Kerry and Waterford.
This warning comes into effect at 5pm on Saturday and run for 24 hours.
These counties are also under a status yellow rain warning, which runs from 1pm on Saturday.
Meanwhile, a status yellow warning for snow and ice has been issued for Cavan, Donegal, Monaghan, Dublin, Kildare, Longford, Louth, Meath, Westmeath and Connacht.