A yellow weather warning for snow is in place for Sunday from 4am, although more southern areas are likely to be worst hit.
Met Eireann has issued a status orange snow and ice warning for Cavan, Monaghan, Donegal, Longford, Leitrim, Mayo and Sligo.
Road users are being urged to exercise extreme caution tonight and tomorrow morning.
Update 9am.: Temperatures will plummet to minus two today as Met Eireann issues two weather warnings.
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Mix of heavy rain sleet & snow will cause unsafe & possibly disruptive conditions in places. "Clearer weather over Ulster with frost will gradually extend southwards during the afternoon".
The alert, which applies to Limerick, Wexford, Clare and Kerry remains valid until 10pm on Sunday while a status orange snow/ice alert remains in place elsewhere in the country. Treacherous roads conditions are expected due to snow accumulation and ice.
Gardaí have said that the majority of motorists have heeded their warning to stay off the roads during the current cold snap. Met Eireann is forecasting a bitterly cold day with top temperatures of just 4 degrees.
"Maximum temperatures 2 to 7C in fresh northerly winds making it feel very raw".