Met Éireann has urged people to take care especially on roads as conditions begin to ease following a night of heavy rain, with one county still under a Status Orange rainfall warning and a further nine under Status Yellow alerts.
A Status Orange rain warning remains in effect for Louth, while a Status Yellow warning is also in place for Cavan, Monaghan, Dublin and Meath, with more rain expected over much of the southeast, east and north of the country.
The forecaster is warning of rain falling on already saturated ground, which could cause localised flooding, river flooding and difficult travel conditions.
A Yellow warning for rain is also in effect for Antrim, Armagh, Down, Tyrone and Derry.
Watch: Wave overtopping in coastal areas of Co Dublin
Speaking on RTÉ's Morning Ireland, Met Éireann meteorologist Mark Bowe said localised flooding will persist for a short time after the warnings end.
He said that areas in the east and in the Wicklow mountains saw very heavy rain yesterday and last night, while parts of the northeast around Louth saw very heavy rain up until midnight.
The eastern half of the country, he said, has seen between two-and-a-half to three times more than its average expected rainfall for the week, which is unusual.
He added that it will be somewhat drier for tomorrow and Sunday but low pressure is still in charge so it will be unsettled with plenty of cloud, and cooler nights but day time highs of 9-10 degrees.
Iarnród Éireann said that DART services are operating between Greystones and Howth, but there are delays through Seapoint due to impact of earlier flooding.
DART and Northern Commuter service are suspended between Malahide and Howth Junction due to a mechanical issue.
It added that the Dublin to Rosslare train line is closed between Greystones and Kilcoole due to debris on the line, and is also closed between Enniscorthy and Wexford due to flooding.
Flooding has been seen in Sandycove and other coastal areas of Dublin, with wave overtopping in places.
Motorists in affected areas are being warned not to drive into floodwater.
No major incidents have been reported across Louth following heavy rain overnight.
There has been localised flooding on a number of roads in Dundalk, Cooley, Ardee and Drogheda.
Wellington Quay in Drogheda is expected to flood at high tide this afternoon.
Delivery of flood relief schemes 'too slow', says minister
Minister for Public Expenditure Jack Chambers has acknowledged the delivery of flood relief schemes has been "too slow", and said that a "paralysis from the culture of judicial reviews" is impacting the progression of some relief schemes.
Speaking on RTÉ's Today with David McCullagh programme, Mr Chambers said he accepted that people in towns impacted by flooding were rightly frustrated at delays to such schemes.
"This comes back to wider infrastructure in the economy. The risk of judicial reviews is a major issue. I think that paralysis that feeds from the culture of judicial reviews is impacting the progression of certain flood relief schemes," he said.
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"Secondly, they are complex environmental and engineering projects which take time."
Asked whether locals who have objected to the implementation of flood relief schemes should be compensated for flooding, Mr Chambers said there "needed to be greater acceptance of infrastructure more generally" and that "people need to think twice about engaging in litigation when there is the level of risk in a local area".
"Secondly, when it comes to people's right to getting immediate support I don't think it's fair to connect the two, I think the State is there to support people in communities when an issue emerges."
Mr Chambers said most people in impacted communities didn't and don't object to such schemes, adding "it's a small minority who use very technical and procedural issues to block infrastructure and they have a right to do that".
"But I don't think the balance of rights isn't there in the Irish system right now and judicial reviews are bringing huge elements of risk aversion across the decision-making process."
A Status Orange rain warning remains in effect for Louth, while a Status Yellow warning is also in place for Cavan, Monaghan, Dublin and Meath, with more rain expected over much of the southeast, east and north of the country.
The forecaster is warning of rain falling on already saturated ground, which could cause localised flooding, river flooding and difficult travel conditions.
A Yellow warning for rain is also in effect for Antrim, Armagh, Down, Tyrone and Derry.
Watch: Wave overtopping in coastal areas of Co Dublin
Speaking on RTÉ's Morning Ireland, Met Éireann meteorologist Mark Bowe said localised flooding will persist for a short time after the warnings end.
He said that areas in the east and in the Wicklow mountains saw very heavy rain yesterday and last night, while parts of the northeast around Louth saw very heavy rain up until midnight.
The eastern half of the country, he said, has seen between two-and-a-half to three times more than its average expected rainfall for the week, which is unusual.
He added that it will be somewhat drier for tomorrow and Sunday but low pressure is still in charge so it will be unsettled with plenty of cloud, and cooler nights but day time highs of 9-10 degrees.
Iarnród Éireann said that DART services are operating between Greystones and Howth, but there are delays through Seapoint due to impact of earlier flooding.
DART and Northern Commuter service are suspended between Malahide and Howth Junction due to a mechanical issue.
It added that the Dublin to Rosslare train line is closed between Greystones and Kilcoole due to debris on the line, and is also closed between Enniscorthy and Wexford due to flooding.
Flooding has been seen in Sandycove and other coastal areas of Dublin, with wave overtopping in places.
Motorists in affected areas are being warned not to drive into floodwater.
No major incidents have been reported across Louth following heavy rain overnight.
There has been localised flooding on a number of roads in Dundalk, Cooley, Ardee and Drogheda.
Wellington Quay in Drogheda is expected to flood at high tide this afternoon.
Delivery of flood relief schemes 'too slow', says minister
Minister for Public Expenditure Jack Chambers has acknowledged the delivery of flood relief schemes has been "too slow", and said that a "paralysis from the culture of judicial reviews" is impacting the progression of some relief schemes.
Speaking on RTÉ's Today with David McCullagh programme, Mr Chambers said he accepted that people in towns impacted by flooding were rightly frustrated at delays to such schemes.
"This comes back to wider infrastructure in the economy. The risk of judicial reviews is a major issue. I think that paralysis that feeds from the culture of judicial reviews is impacting the progression of certain flood relief schemes," he said.
We need your consent to load this rte-player contentWe use rte-player to manage extra content that can set cookies on your device and collect data about your activity. Please review their details and accept them to load the content.Manage Preferences
"Secondly, they are complex environmental and engineering projects which take time."
Asked whether locals who have objected to the implementation of flood relief schemes should be compensated for flooding, Mr Chambers said there "needed to be greater acceptance of infrastructure more generally" and that "people need to think twice about engaging in litigation when there is the level of risk in a local area".
"Secondly, when it comes to people's right to getting immediate support I don't think it's fair to connect the two, I think the State is there to support people in communities when an issue emerges."
Mr Chambers said most people in impacted communities didn't and don't object to such schemes, adding "it's a small minority who use very technical and procedural issues to block infrastructure and they have a right to do that".
"But I don't think the balance of rights isn't there in the Irish system right now and judicial reviews are bringing huge elements of risk aversion across the decision-making process."