A status yellow rainfall warning will remain in place in Co Louth and five other counties in Leinster until 9pm tonight.
The alert, which came into effect at 6pm yesterday, warns of spells of heavy rain and some spot flooding.
It will also impact Dublin, Kildare, Wicklow and Meath.
Already Irish Rail have warned of delays for local rail commuters this morning due to a track fault between Drogheda and Dundalk which they said was “due to rising water levels.”
Matthew Martin of Met Éireann said a low pressure system moving over the Irish Sea will feed into some heavy showers.
“It’s quite similar to the event we had on Monday of this week,” he said, bringing with it the risk of spot flooding.
It is estimated that between 20mm and 30mm of rain will fall in the Greater Dublin Area.
The wind over the Irish sea at this time of year is the reason for the east being affected, in particular, explained Mr Martin.