A Status Yellow rainfall warning has been issued for Connaught counties from 6pm this evening.
The counties of Cavan, Monaghan, Donegal, Longford, Louth, Westmeath and Meath will also be effected.
It will remain in place until 6am tomorrow (Thurs) morning.
According to Met Éireann, the heavy rain will pose the risk of localised flooding.