A Status Orange rain warning remains in effect for counties Dublin, Wexford and Wicklow until 8am, with significant flooding and hazardous travelling conditions.
Met Éireann is warning of "significant rainfall accumulation", especially on high ground and exposed areas expected.
A Status Yellow rain warning for 13 counties is in effect until 9am.
The warning covers Carlow, Dublin, Kildare, Kilkenny, Louth, Meath, Wexford, Wicklow, Cork, Kerry, Limerick, Tipperary and Waterford.
Met Éireann has warned that these counties could be impacted by flooding, difficult travelling conditions and poor visibility.
Separately, a Status Yellow wind warning for Dublin, Louth, Meath, Wexford, Wicklow is in effect until 4am, with strong and gusty northeasterly winds forecast.
Senior forecaster at Met Éireann Gerry Murphy said that it is a very wet day with blustery winds coming in off the east coast.
Mr Murphy said that there is persistent rain in many places, with quite heavy rain in Munster, parts of the midlands and east Leinster.
