A Status Yelllow rain warning is in place for Clare, Kerry, Galway and Mayo.
The alert came into effect at 8pm last night and will remain in place until 8pm this evening.
Met Éireann said persistent rain will turn heavy at times, with possible localised flooding, difficult travel conditions and poor visibility.
It will be mostly dull and blustery with outbreaks of rain continuing throughout the day and into the night in parts of Munster and south Leinster.
Elsewhere will be drier with clear spells and isolated showers in light to moderate southerly winds.
It will be quite mild with highest temperatures of 13C to 16C in fresh to strong southwest winds.
