A status yellow rain warning is in place from 7pm tonight.
The worst of Storm Ciarán is forecast to pass off the south-east and eastern coast tonight and tomorrow.
A status yellow rain warning is in place for Carlow, Cork, Kilkenny, Waterford, Wexford and Wicklow from seven o'clock tonight.
Persistent showers are expected to lead to flooding in parts, and motorists are being warned to expect difficult driving conditions.
A marine warning is also in place until Saturday.