Numerous weather alerts have been issued across the island of Ireland as the cold snap continues.
In Northern Ireland, a yellow ice and snow warning is to take effect from 21:00 GMT on Saturday until 18:00 on Sunday.
Between 5-10 cm of snow is possible over the Mournes, Sperrins and Antrim Hills, with lighter dustings elsewhere, the Met Office said.
The forecaster said there is likely to be disruption to transport and some infrastructure and ice will be an additional hazard, especially on untreated surfaces.
“Spells of rain, sleet and snow will develop from the south late Saturday before clearing through Sunday,” the forecaster added.
“Coastal areas will likely see rain, but inland and over higher ground, sleet and snow is more likely.”
Meanwhile, four Irish Cup fifth round ties have been postponed following pitch inspections on Saturday, and the GAA has said it will monitor the condition of playing surfaces over the weekend.
Katesbridge in County Down recorded the coldest temperature on the island of Ireland at -6C (21.2F) on Friday.
Naimh McElroy, from NI Water, said people should take “extra care” around waterways during the cold snap.
Reservoirs and loughs can “look frozen but if they freeze over it’s impossible to tell how thick the ice is,” she said.
She warned that “ice can be thin in places” and “there is a very real risk of someone drowning.”
“Dog owners also need to remember to keep four legged friends on a lead if they are being walked near reservoirs and other bodies of open water,” she added.
In England and Wales, severe amber warnings for snow and ice are in place throughout the weekend with the Met Office warning that up to 30-40cm of snow could be possible in parts of Northern England.