A Status Yellow warning remains in place this morning from Met Eireann as commuters have been warned to travel with care.
Frost will remain in most places and temperatures stay at freezing.
Temperatures across the country hit a low of minus five degrees overnight - and it is expected they will stay at between two to three degrees later today.
Despite this, air stayed reasonably dry overnight with no major icy patches reported on the roads earlier today.
"It might not be quite as icy as you would think with those sort of temperatures," Met Eireann forecaster Joan Blackburn told Independent.ie this morning.
"The frost will take quite a while to go and will linger in some places.
"However, the day will be sunny.
"There are a few freezing fog patches before dawn but there shouldn't be too many of them.
"The temperatures this afternoon will level around two or three degrees in inland areas, with six degrees in coastal areas."
It will mainly be a dry day with a outside risk of wintry showers.
Tonight will turn cold and frosty once again, with temperatures ranging between minus one and six degrees. It is forecast to cloud over in the north, which may lead to temperatures rising there overnight and some rain.
But Met Eireann has also announced that Dublin Airport experienced its sunniest January since 1959 – but that doesn’t mean it’s been warm.
It was also the second sunniest January at the airport since records began 74 years ago, with a monthly sunshine total of just over 92 hours.
The figure refers only to the number of hours the sun shone and has no link to temperature.
The outlook for this week is for mainly dry, cold weather, according to Met Eireann.
“High pressure is covering the country, so it’s giving a lot of dry, settled weather, but it will be cold during the day and at night over the coming days,” said forecaster Eoin Sherlock.
He said temperatures will struggle today to recover from the hard frost of last night, and will be between 2C and 3C with up to 6C in coastal areas.
“There will be a slight increase in temperatures as we go towards the weekend,” said Mr Sherlock.
“There is always the risk of a couple of showers developing along the north and east coasts. They could be wintry in nature, but for 99pc of the country it’s going to be dry.”
It will be another cold night tonight, with temperatures expected to dip to –4C.
However, the air pushing over the country will be milder come the weekend, with temperatures reaching between 6C and 8C on Saturday and up to 9C on Sunday.
“There will be an increase in daytime temperatures towards the weekend, but it will still be cold at night,” he said.
Overall, last month experienced a mixed bag of weather, with most recording stations reporting their windiest January in up to 22 years.
Gale (force 8) and strong gale (force 9) winds were reported on nearly two thirds of January days, with storm (force 10) winds at some Atlantic coastal stations.
Last month also saw variable rainfall but near normal mean temperatures.