The ESB has issued a flood warning for towns in Co Kildare that lie on the banks of the River Liffey including Ballymore Eustace, Kilcullen, Newbridge, Clane, Celbridge and Leixlip.
Members of the Defence Forces have been mobilised to deal with rising floodwater in parts of the county.
Dublin Civil Defence members are also making their way to Kildare to support the local authority and army personnel.
Heavy rain has also caused a number of road closures around the country.
In Kildare the on M7 Dublin/Limerick Road; the roads from Kill to Johnstown and from Johnstown to Naas are impassable due to flooding.
The N4 Dublin/Sligo Road is very badly flooded between the Leixlip East and Kilcock junctions but is passable.
Other affected counties include Limerick, Meath, Galway, Westmeath and Cavan.
Drivers are being urged to switch on headlights and reduce speed.