A status yellow weather warning has been issued with unseasonably wet and windy conditions forecast for counties Clare, Cork, Kerry, Limerick, Waterford, Donegal, Galway, Leitrim, Mayo, Sligo and Wexford.
The warning from Met Éireann, issued on Sunday, is for the early hours of Monday morning, until 10pm that night.
Southwesterly winds, veering northerly through Monday, will reach average speeds of 50 to 65 km/h with gusts up to 100 km/h, particularly in coastal areas and on higher ground, according to the meteorological service.
Heavy rain in conjunction with the wind will lead to spot flooding. There is a risk of wave overtopping in coastal areas.
There is also a warning of gales for all Irish coastal waters and on the Irish Sea.
Southwesterly winds veering northerly will reach Gale Force 8 or strong Gale Force 9 at times during the night and on Monday on all Irish coastal waters and on the Irish Sea, said the service.