A 24-hour weather warning is in place 18 counties.
The Status Yellow warning for rain includes all of Leinster as well as Cavan, Monaghan, Leitrim, Roscommon, Tipperary and Waterford.
Met Éireann says rain will be "persistent and heavy at times."
People are being warned of potential localised flooding and difficult travelling conditions. Poor visibility is also likely in many places.
The weather warning is in place until 4am on Wednesday.
This morning rain in Munster and south Leinster will spread northwards and extend into Ulster.
It will continue through the day and will become heavy at times in parts of Leinster and Ulster.
Western coastal counties will stay mainly dry.
⚠️Status Yellow-Rain warning for Leinster,Cavan, Monaghan,Leitrim,Roscommon,Tipperary, Waterford⚠️
Potential Impacts:
• Localised flooding
• Difficult travelling conditions
• Poor visibility
Valid: 04:00Tues 09/07 to 04:00 Wed 10/07
Warning ➡️https://t.co/FhFWKx6AbX pic.twitter.com/HaYlUTrqWY— Met Éireann (@MetEireann) July 8, 2024
Tonight rain will continue over Ulster, north Connacht and the northern half of Leinster.
It will be drier further south with some clear spells developing in Munster.
Wednesday will continue mostly cloudy over much of the northern half of the country with further outbreaks of rain and drizzle.
It will be brighter further south with some sunny spells.