Met Éireann has issued a yellow alert wind and rainfall warning for Cork, Kerry, Waterford and Wexford.
Heavy rain will lead to accumulations of between 25mm and 50mm and spot flooding is possible. Met Éireann said there is the potential for higher values in mountainous areas.
The alert will be in effect from 6pm this evening until 6pm Thursday.
The rain will be accompanied by strong southeasterly winds reaching mean speeds between 50 and 65km/h at times, with gusts between 90 and 100 km/h.
Winds will be strongest along coastal areas.
the wind warning will be in effect from 4pm this afternoon until 2pm tomorrow.