Met Éireann has issued a rainfall warning in place for Munster and Leinster.
It is forecasting 20mm-40mm of rain up until 6pm tomorrow.
Several roads around the country remain flooded, according to AA Roadwatch.
Roads in counties Galway, Leitrim and Mayo are the worst affected.
There is less severe flooding in counties Clare, Cork, Kilkenny and Tipperary.
Christmas Day 2015 transport for the Foxe family , Annagh , county longford . Lots more affected by flooding today pic.twitter.com/ZnIs4d2xzc
— Ciaran Mullooly (@ciaranmullooly) December 25, 2015
There are also Status Yellow marine warnings in place for wind and small craft - reinforcing the message that people should take care on or near the water.
