Met Éireann has issued a Status Yellow - Wind and Rain warning for County Donegal.
The warning also applies to Counties Clare, Cork, Kerry, Limerick, Waterford, Galway, Leitrim, Mayo, Sligo and Wexford.
It is valid from 03:00 Monday (May 3) until 22:00 Monday (May 30).
Met Éireann said the weather will be unseasonably wet and windy.
"Southwesterly winds, veering northerly through Monday will reach mean speeds of 50 to 65 km/h, with gusts up to 100 km/h, particularly in coastal areas and on higher ground.
"Heavy rain, in conjunction with the wind, will lead to spot flooding with a risk of wave overtopping in coastal areas."
Met Éireann has also issued a Status Yellow - Marine warning for all coastal waters and on the Irish Sea.
The warning is valid from 00:00 Monday (May 3) to 00:00 Tuesday (May 4).
"Southwesterly winds veering northerly will reach gale force 8 at times on Sunday night and Monday on all coastal waters and on the Irish Sea.
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