People are being asked to check up on elderly and vulnerable neighbours as temperatures plunge fall below freezing.
Met Éireann has issued a status yellow low temperature and ice warning, which is in place until 10am.
Temperatures fell as low as minus four in the midlands overnight.
Dublin Fire Brigade has urged people to phone others who might have trouble staying warm to see if they need help.
Very cold tonight dry and clear in most areas with just isolated wintry showers on northern coasts Lows of minus 4 to 0 degrees generally leading to a sharp frost and icy conditions in light to moderate northerly winds, with some mist and fog patches developing in sheltered areas pic.twitter.com/0rMg5ghcS2
— Met Éireann (@MetEireann) January 2, 2021
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The forecast for Saturday night is very cold with lows of minus 4 to minus 2 degrees. Colder locally inland with a sharp frost and icy conditions to form early in the night, while temperatures near the coast will linger at around freezing.
Largely dry and clear with mist and fog pockets developing in places, however light to moderate northerly winds will bring isolated wintry showers to northern coasts towards morning.
On Sunday, frost and ice on untreated surfaces will be slow to clear tomorrow, Sunday. It will be dry in many areas with good sunshine and scattered showers near coasts.
Some showers will drift further inland in Leinster during the evening, and may turn wintry. Bitterly cold throughout the day with highest temperatures of just 1 to 4 degrees generally, in a light to moderate northeast breeze.
