A status yellow rainfall warning has been issued 14 counties.
The alert for Munster, Carlow, Kildare, Kilkenny, Laois, Wexford, Wicklow, Offaly and Galway will come into effect from 2.00am on Monday.
Met Éireann says there will be heavy, possibly thundery, rain at times overnight and during Monday.
Yellow Rainfall Warning. Heavy, possibly thundery, rain at times overnight and during Monday with accumulations of 25 to 40mm in places. Localised flooding may occur. For Munster, Carlow, Kildare, Kilkenny , Laois, Wexford, Wicklow, Offaly and Galway.
— Met Éireann (@MetEireann) August 16, 2020
This will see between 25mm and 40mm of rain in places.
It also says localised flooding may occur.
The warning is in place until midnight.