Met Éireann has issued two status yellow rain and thunder warnings for parts of the south and west.
A rainfall warning is in place for counties Wexford, Cork and Waterford until 6am on Sunday.
Spells of heavy rain are forecast, especially in coastal areas, with a risk of localised flooding.
The warning comes after flooding in parts of Co Cork overnight, with many road diversions still in place.
Over night downpours have led to homes and properly being damaged by flood waters in Dunmanway and other parts of West Cork again this morning. Thanks to the swift action of the local residents, local emergency services and council staff for preventing further damage being done. pic.twitter.com/gAD88pnDLY
— Cllr Declan Hurley (@DeclanHurley) August 15, 2020
Meanwhile, there is a yellow thunder warning in place until 9pm on Saturday for Munster and counties Carlow, Kilkenny, Laois, Wexford, Offaly, Galway, Mayo and Roscommon.
The forecaster said there is a risk of thunderstorms bringing heavy downpours, hail and localised flooding.
Status Yellow Rainfall Warning:
For Wexford, Cork and Waterford
For the rest of today and overnight, there’ll be spells of
heavy rain at times, especially in coastal areas with a
risk of localised flooding.
Valid: 12:00 Saturday, 15-Aug-2020 until 06:00 Sunday, 16-Aug-2020 pic.twitter.com/f1h6B1N6zg
— Met Éireann (@MetEireann) August 15, 2020