The gardai have issued a warning to motorists regarding dangerous 'very driving conditions' as the country is bracing itself for a cold, windy and very showery day - as well as two ongoing weather warnings affecting 12 counties.
Met Éireann have issued a snow-ice warning for Cavan, Monaghan, Donegal, Louth and Leitrim.
The status yellow warning came into effect at 3am overnight and will remain in place until 3am today.
Meanwhile, a status yellow wind warning has also been issued for Donegal, Galway, Leitrim, Mayo, Sligo, Clare, Cork, Kerry and Limerick.
It will come into effect at 6am on Wednesday and will remain until midnight as winds are expected to reach 50-60km/hour along the coast.
This morning, gardai also issued a separate warning to motorists regarding the dangers expected to be caused this afternoon by hail.
They say that from midday until 3pm today hail has been forecast and they issued some advice to motorists including switching off cruise control, reducing speed, turning on hazard lights and avoid sudden steering movements and braking.
AA Roadwatch have already warned that there are reports of snow on some roads in Donegal.
There are also reports of slippery conditions following a snow shower in Louth.
Met Eireann's Siobhan Ryan said on Morning Ireland: "The next few days are set to be unstable weather-wise. It's set to be bitterly cold tonight with temperatures dropping to between 1 and 3 degrees.
"Tonight will be blustery, with nonetheless some frost and ice possible towards dawn.
"Friday will have crisp winter sunshine throughout the day, overall quite pleasant albeit with a chilly start.
"Saturday will be dry, bright and cold, with a scattering of heavy showers on Saturday," she added.
The latest forecast issued by Met Éireann reads; "Cold, windy and very showery today; some sunny spells in between showers too though. "Some wintry showers possible early on.
"Showers will be heavier later, merging to longer spells of rain, with the threat of hail/thunder.
"Feeling raw. High [temperatures of between] 4 to 7 degrees, in strong & gusty W to NW winds."
People were warned to expect frost and the risk of icy patches in sheltered spots overnight.
Thursday will be another cold and windy day with bright or sunny spells.
Top temperatures will reach between 6C and 9C but Met Eireann said that it will feel colder with fresh and gusty northwesterly winds.
Thursday night's temperatures will plummet to -2C with hard frost and icy surfaces overnight.
The frost is expected to clear before Friday but cloudy conditions and damp weather is expected to spread across the country from the Atlantic during the afternoon and evening.
It will be a rainy night with showers continuing into Saturday morning.