Met Éireann has issued a rainfall warning for Connacht and six other counties.
The Status Yellow warning covers the five counties in Connacht, as well as Longford, Louth, Westmeath, Meath, Cavan and Monaghan.
It comes into effect from 9pm tonight until 9pm tomorrow.
Met Éireann has forecast accumulations of between 30-50mm, with higher accumulations in mountainous areas, which will bring a risk of some river and localised flooding.