A status yellow rainfall warning has been issued for 12 of counties in the north and west of the country.
Met Éireann has forecast heavy rain with a risk of localised flooding for Donegal, Meath, Westmeath, Louth, Monaghan, Cavan, Longford and all of Connacht.
The warning will come into force at 6pm and remain in place until 6am Thursday morning.
Here is the latest hourly cloud and rainfall forecast from our HARMONIE high resolution weather model. It covers the period from now until 18:00 on Friday.
Our latest national forecast and outlook can be found here: https://t.co/9gKN6SVok4 pic.twitter.com/EL7mQA4Xv0— Met Éireann (@MetEireann) January 27, 2021
The UK’s Met Office has also issued a weather warning for all six counties in Northern Ireland, from 6pm on Wednesday to 9am on Thursday.
The forecaster said heavy rain would bring some flooding and transport disruption in the region.
