Met Éireann has issued a weather warning as up to 40mm of rain is forecast to fall over the east of the country this evening.
It said that around three weeks' worth of rain would fall tonight, which could result in localised flooding in places.
Speaking on RTÉ's Six-One News, Gerard Fleming said the rainfall would be more like 10mm-15mm in most places.
He said the rain would be nothing like that being experienced in Britain.
Met Éireann issued the weather warning due to the persistent nature of the rain and the fact that water levels are quite high.
Overnight the rain is due to spread to the west and ease off over Leinster and Munster.
Dublin City Council has not issued a weather warning in relation to the expected rain.
However, it says that until 6am tomorrow its drainage division will be monitoring rainfall levels and will be liaising closely with Met Éireann.
The council says that since the flood in October 2011 it has added a large amount of rain gauges throughout the city and that these are also being monitored during the rainfall.
Britain hit with heavy rain
Torrential rain led to flooded homes, road closures and havoc on public transport across parts of Britain today.
Dozens of flood warnings and alerts were in place as the latest downpours continued to fall on ground already saturated after three months of record-breaking rainfall across the UK.
Almost 100 properties were flooded, the M50 was among a number of roads closed by the bad weather and flooding and landslips caused delays on major rail routes.
Six people had to be rescued from a flooded caravan park in North Yorkshire after heavy rain left the site under half a metre of water.
The worst affected area tonight and into tomorrow morning is expected to be southwest England, which has already seen extremely heavy rain, with 40mm falling in just half an hour in Somerset this afternoon.
Forecasters said a further 80mm is expected to fall across the southwest tonight.
Northumberland could also see very heavy rain and flooding this evening, Britain’s Environment Agency said.