Unsettled weather is to bring rainfall of 30mm to 50mm across the country on Saturday 15 December.
Met Éireann issued a yellow weather warning for the whole country that will be in place for all 24 hours of Saturday.
It is predicting that heavy rain could see rainfalls in excess of 50mm in some mountainous areas.
A yellow wind warning has also been issued, as gusts of up to 110km/h are likely for Saturday afternoon.
The warning is in place for all of the country, as south to southeast winds reach 55km/h to 60km/h on Saturday morning.
The winds will be strongest in the east and will veer west to northwest into the afternoon and evening.
They will further increase to reach speeds of 55km/h to 65km/h.
Gusts associated with these winds will range from 90km/h to 110km/h.