A status yellow rain warning has been issued for Donegal and almost all other counties this Sunday.
The warning was issued by Met Eireann ahead of heavy rain with isolated thunderstorms. The adverse weather may cause disruption and localised flooding.
Cork and Waterford will be worst-hit by the weather, with a status orange warning in place for both counties.
The alerts are valid from 3am Sunday morning until 3am Monday 12th September.