Met Éireann has issued a weather alert countrywide for this evening and tomorrow.
Heavy rain is expected leading to flooding in places.
Met Eireann says it expects showers to develop in all areas this evening with up to 70mm of rain expected to fall between now and Tuesday morning.
Coastal counties of Munster and Leinster are most at risk for the highest rainfall and flooding is probable in some areas.
It will also be extremely windy - especially on Monday morning with southeasterly gales and gusts of 80km-110km an hour in exposed areas.
Theres a gale warning in place and high winds are expected on Irish coastal waters from Fair Head to Carlingford Lough to Mizen Head and on the Irish Sea.