A status yellow rainfall warning has been issued for five counties nationwide.
Met Éireann said the warning for Wexford, Cork, Kerry and Waterford will come into effect at 2pm tomorrow afternoon and will last until Sunday morning at 5am.
The forecaster said heavy downpours are expected with spot flooding likely along coastal areas.
The rainfall warning was also issued for Donegal from tonight at 8pm until 2am tomorrow morning.
Up to 40mm of rain could fall in the counties over the next few days.
— Met Éireann (@MetEireann) September 27, 2019
A status yellow small craft warning was also issued this afternoon.
Met Éireann says that westerly winds will reach force 6 or more at times today and overnight on coasts from Carlingford Lough to Roches Point to Rossan Point.
It is forecasting heavy or prolonged showers to spread eastwards across the country overnight, with northern areas worst affected.
Sunny spells will develop into persistent or heavy rain tomorrow in the south and will spread over Munster and Leinster in the evening with the risk of flooding.
There is a good possibility that these conditions will extend over Ulster and Connacht.
As for the rest of the weekend, things are looking up for Sunday, with a bright, breezy day with sunny spells and some scattered showers in store.
Main image: People sheltering from the rain in Dublin. Photo: Brian Lawless/PA Archive/PA Images