A Status Orange rainfall warning is now in place for Waterford, Wexford and Wicklow.
Met Eireann has issued the alert which will be in place until 8am on Thursday morning.
The Road Safety Authority (RSA) has urged all road users to exercise caution this evening and into tomorrow due to the weather warnings.
Updated Status Orange Rain warning for Waterford, Wexford, Wicklow
Valid: 17:30 Wednesday 27/10/2021 to 08:00 Thursday 28/10/2021— Met Éireann (@MetEireann) October 27, 2021
Meanwhile, yellow rainfall warnings are in place for Kildare, Laois, Tipperary, Cork, Carlow, Kilkenny and Kerry until Thursday morning.
It is expected that heavy rainfall will lead to some river flooding and localised surface flooding in these areas.
Motorists are being asked to slow down and avoid flooded roads as they can appear shallow and can have debris such as fallen trees.
The RSA has said pedestrians and cyclists should keep safe by making sure they can be seen. Cyclists are asked to make sure they have lights on their bike.
Road users affected by warnings for heavy rainfall are advised to check local traffic and weather conditions before setting out on a journey.