Temperatures to plummet to below zero tonight
There will be frost and icy patches today across the country, and forecasters are advising drivers to take care.
Heavy and possibly thundery showers will also fall today, moving from the west to the east. Showers will become isolated in the west by this evening.
Joanna Donnelly from Met Eireann said: "It's not a great day today, it's going to be fairly cold. But temperatures are going to start pick up to six to nine degrees by this evening."
"Showers are going to pull back to the West coast and most places are going to become dry."
However, she warned: "There will be ice on untreated surfaces in all areas."
Temperatures will plummet "fairly rapidly to below zero overnight," Ms Donnelly said.
For tomorrow, rain will fall nationwide and this will bring milder temperatures.
"It'll start to get milder tomorrow and it'll be raining. Once the rain starts the temperatures will pick up again to around nine to eleven degrees."
Last night heavy showers fell in the south and west of the country. Ground frost with some icy patches was visible, with temperatures between zero to five degrees.
In Dublin this morning, traffic is very heavy inbound on the N4/ Lucan road from Junction 4 Newcastle to the Kennelsfort road junction.
There have also been reports of extremely long delays northbound on the M7 from Junction 2 Newbridge to Junction 10 Naas South, following a crash earlier this morning.
There has also been a collision on the M50 northbound at Junction 10 Ballymount, and traffic has been affected.
AA Roadwatch say black ice has been reported around Prosperous & Allenwood this morning.