Met Éireann has issued a status yellow rain warning for the south of the country as well as part of the west.
The alert covers counties Carlow, Kilkenny, Wexford, Galway and the whole of Munster.
Met Éireann said there will be heavy rain and some thundery downpours that could result in spot flooding.
The warning will be in effect until 2pm tomorrow.
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A marine warning is also in place for small craft from Fair Head to Wicklow Head to Mizen Head
Met Éireann said east to southeast winds will occasionally reach force 6.