Status Orange rainfall warnings are in place for Dublin and Wicklow, with immediate effect.
Met Éireann said this warning is in place until 8am tomorrow.
This may result in localised flooding, dangerous driving conditions and poor visibility.
The meteorological service said that spells of heavy rain are expected across the country as rain over Ulster & Leinster will spread southwest over Connacht & Munster.
A Status Yellow warning is in place in Meath and Louth until 9pm this evening.
The UK Met Office has also issued a Status Yellow warning for all six counties in Northern Ireland until 9am tomorrow.
Communities in Cork, particularly Midelton, have been left devastated by flood damage caused by Storm Babet this week.
Cork County Council has warned this morning that there is further risk of flooding in Midleton today and asked the public to avoid the area.
“Following further heavy rain overnight, the River Owenacurra river levels continue to rise, resulting in a high risk of further flooding in Midleton,” the council said.
“There is a particular risk at present at Woodland estate,” it added.
Met Éireann has received criticism for not raising a Status Red warning in Cork sooner than it did, with Mayor of Cork Frank O’Flynn calling for an investigation into the matter.