There is a flood risk in 17 counties as heavy rain is due to fall on already saturated ground.
Met Éireann has issued a Status Yellow warning for rain for all of Leinster as well as counties Cavan, Monaghan, Cork, Tipperary and Waterford.
The warning will be in effect between 11pm tonight and 11pm tomorrow night.
It is a significant expansion of the advisory which was first announced yesterday.
The forecaster said there is a risk of flooding, poor visibility and difficult travelling conditions in these areas, which are also experiencing high river levels.
The inclement conditions will be exacerbated by strong and gusty south-easterly winds in five of these counties.
Wexford, Wicklow, Meath, Louth and Dublin will also be under a Status Yellow warning for wind, with Met Éireann also cautioning against wave overtopping amid high tides.
The wind warning will be in place between 11pm tonight and 1pm tomorrow afternoon.
The double warning applies to areas in the east of the country which have been severely affected by flooding in recent weeks.
⚠️Status Yellow Rain Warning issued⚠️
Leinster, Cavan, Monaghan, Cork, Tipperary, Waterford
⚠️Status Yellow Wind Warning issued⚠️
Dublin, Louth, Meath, Wexford, and Wicklow
Both valid: 17/2 23:00 to 18/2 23:00
Detailsℹ️https://t.co/lvQFgW8DsS pic.twitter.com/O8olf43ZDv
— Met Éireann (@MetEireann) February 17, 2026
Meanwhile, a Status Yellow rain and snow warning for counties Donegal, Leitrim and Sligo will come into effect at 2am tomorrow morning and will remain in place until 2pm.
Met Éireann said heavy rain could turn to sleet and snow, which could lead to poor visibility and difficult travelling conditions.
In Northern Ireland, a Status Yellow ice warning for Northern Ireland expired at 10am this morning.
The UK Met Office had warned that wintry showers followed by clearing skies would lead to the risk of ice.