The warning is in effect up until 9.00pm on Wednesday
Met Éireann has issued a status yellow rainfall warning for Munster and Leinster.
The forecaster says heavy rain is expected to move up from the south overnight on Tuesday.
However this will clear later on Wednesday.
Between 30 to 40mm of rain is expected, but it says larger totals are possible on high ground.
The warning is in place from midnight Wednesday up until 9.00pm.