Up to 40mm of rain is forecast.
Met Eireann's warning of possible flooding in parts of the east, midlands and north-west over the next 24 hours.
Up to 40mm of rain is forecast, with a Status Yellow alert in place for 12 counties until tomorrow morning.
Strong winds will also affected Atlantic coastal counties - two Status Yellow warnings are also in place until later tonight.
Forecaster, Andrew Doran Sherlock, says it's not looking good for the rest of the week either:
Energy Efficiency Roadshow Comes To Laois This Afternoon
Laois Soccer Club Plans New Clubhouse And Changing Facilities
Westmeath Hotel Reopening After Norovirus Outbreak
Eight Legal Aid Certificates Issued In Laois Amid Solicitors’ Boycott
Ireland Still Faces STEM Gender Gap Despite Strong PISA Results
Just Five Of 25 Promised Psychosis Teams Operating Nationally
GAA ‘Not Ready’ For Proposed Integration With LGFA And Camogie Association
Offaly Firefighter's 9/11 Memorial Trip Delayed For A Second Day