Met Eireann is warning of a risk of spot flooding.
A status yellow rainfall warning has been issued for eight counties in the south and south-east from later tonight.
Met Eireann says up to 30 millimetres of rain is possible in Carlow, Kilkenny, Laois, Wexford, Wicklow, Cork, Tipperary and Waterford.
The forecaster is warning of a risk of spot flooding.
It will run from 8pm tonight until 10am tomorrow morning.