The cold spell is set to last over the weekend as Met Eireann issues a Status Yellow weather warning for snow & ice.
Thursday night will be very cold with severe frost and icy roads predicted.
Met Éireann has issued a snow and ice warning for the entire country.
The yellow low-temperature warning extends nationwide from Thursday night at 11 pm until Friday morning with lowest temperatures of zero to minus 3 degrees.
A yellow snow and ice warning is also in place with Ulster and Connacht expecting scattered snow showers from 5 am on Friday and midday on Saturday.
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Friday will be another cold day with some heavy and wintry showers but there will be some sunny spells.
Temperatures are expected to remain below normal over the weekend despite some periods of sunshine during the day. Most of the rain on Friday and Saturday will be in Atlantic coastal counties, with a few wintry on high ground. It should be mostly dry elsewhere.
Sunday will bring some hazy sunshine after the early frost clears but cloud and rain will move across Ireland from the Atlantic during the afternoon.
The early outlook for next week is for more cold and changeable weather.