A Status Yellow snow and ice warning is due to remain in place around the country until 9am.
A separate Status Yellow snow and ice warning will then come into force for Donegal Leitrim and Sligo. It is due to remain until 12pm tomorrow.
Met Éireann said Showers of hail, sleet and snow will continue in the area throughout Wednesday and early Thursday, leading to icy patches.
There will also be some snow accumulations over high ground.
TODAY
Any frost, ice and patchy lying snow will gradually thaw this morning.
A cold and bright day will follow, with sunny spells and scattered showers.
The showers will be mainly a mix of rain, hail and sleet, but a few snow showers are still possible, mainly in parts of the north and northwest.
Cloud will thicken from the Atlantic this afternoon and rain will push into the southwest by evening.
Top temperatures of 4C to 7C. This morning’s moderate westerly breezes will back light to moderate, west to southwest later day.
TONIGHT
Patchy rain and sleet, will extend eastwards over the southern half of the country tonight clearing most places before dawn.
Further north, scattered wintry showers will continue for a time, before retreating to northwestern areas overnight.
It will be a cold night countrywide, with lows ranging from -2C to plus 1C, leading to a sharp frost and icy stretches.
Winds will be mainly light westerly or northwesterly, but increasing fresh and gusty on northwestern coasts by morning.