The yellow ice and snow warning in place over the weekend has been extended into Monday.
The Met Office has said icy surfaces are likely to pose a hazard, with patches on untreated roads, pavements and cycle paths.
Commuters are advised to leave longer for their journey times by road, and to expect delays on bus services.
Fresh snow fell overnight on Saturday in southern parts of the province, and is expected to spread northward during Sunday although not all parts will be impacted.
Freezing fog is also expected in some parts, although conditions will gradually brighten up through the morning.
The maximum temperature forecast for Monday is 3C, although this will dip as low as -6C overnight into Monday.
More heavily impacted will be Scotland, with 2cm to 5cm of snow expected to fall over northern parts, and as much as 5cm to 10cm possible over some mountains.
An amber warning is also in place for parts of England and Wales.
The Met Office warning will remain in place for all parts of Northern Ireland until 12pm on Monday.
Translink has advised that all services are subject to delays and disruption due to poor road conditions.
Currently the 1E service is unable to serve Hightown Turning Circle, and will turn right onto Mallusk Road on outbound journeys and left onto Hightown Road on inbound journeys.
The 12C will be omitting Ligoniel, operating outbound to Glenbank Corner. Will then operate via Crumlin Road, Bilston Road back onto Crumlin Road for inbound journey.
Belfast Telegraph Digital