Met Éireann has issued a Yellow Rainfall Warning for Leinster, Connacht, Cavan, Monaghan and Donegal, with between 30mm and 40mm of rainfall likely overnight and tomorrow.
A spell of heavy and locally thundery rain is expected to result in intense downpours in most parts of the country.
In anticipation of the heavy rainfall, Dublin City Council has decided to mobilise its drainage on-call crews and road gully crews from 5am tomorrow as a precautionary measure.
Meanwhile, the ESB has warned of possible power outages as a result of the weather. It said possible lightning may lead to outages.
Customers are advised to check powercheck.ie or call 1850-372-999 for updates.