A status yellow rain warning has been issued for 13 counties.
Met Éireann said spells of heavy rain brings the potential for localised flooding.
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Cavan, Donegal, Monaghan, Dublin, Kildare, Longford, Louth, Meath, Westmeath, Leitrim, Mayo, Roscommon, Sligo are the counties under the warning.
The alert came into effect at 6.30pm on Saturday evening and is due to remain in place until 11am on Sunday.
