A Status Orange rainfall warning will remain in effect for Cork and Waterford until 6pm tomorrow.
Meanwhile, a Status Yellow rain warning will remain in place for Connacht, Kilkenny, Clare, Kerry, Limerick and Tipperary until 6pm tomorrow.
Met Éireann said a spell of heavy rain this evening and tonight will lead to the risk of flooding with hazardous driving conditions.
The heaviest rain will occur on the south coast and in mountainous areas.
TODAY
Today will be wet over much of Munster, Connacht, west Ulster and in the west and south of Leinster with spells of heavy rain.
The rain will become lighter and more patchy in many parts through the afternoon.
Northeast Leinster and much of Ulster will remain mostly dry with a few brighter spells for a time.
Cold and blustery with highest temperatures of just 5C to 9C in fresh to strong, gusty southeast winds.
TONIGHT
Rain will become persistent and heavy again this evening and overnight spreading up over Munster, Connacht and South Leinster.
Very heavy thundery downpours are likely over South Munster with some flash flooding.
Southeast winds strengthening further overnight with gales at the coast. Lowest temperatures 3C to 5C.