Heavy rain means there may be risk of flooding.
A status Yellow rain warning has been issued for five counties on Christmas Day.
Carlow, Kilkenny, Wexford, Wicklow and Waterford all look set for a downpour.
Met Éireann say persistent rain on the day will give a total of 30 to 50 mm of rain. This heavy rain may lead to localised flooding.
The warning comes into effect at 12am on Saturday and will run until 11pm that night.
Overall, the 25th will be a wet, cloudy and windy day, with widespread rain.
It’ll be a bit of a damp #ChristmasDay this year with a band of rain moving across the country?️
A #Yellow rain warning has been issued for Carlow, Kilkenny, Waterford, Wexford & Wicklow where there'll be a risk of spot flooding, so take care on the roads if you’re travelling⚠️ pic.twitter.com/Ojb4zA2u77
— Met Éireann (@MetEireann) December 24, 2021
It’s not all bad news, as brighter conditions with scattered showers are set to develop over the afternoon in the southwest and west of the country.
Highest temperatures will be between 7C to 11C. However, it will stay wet for much of the day across Leinster and Ulster.