MET Eireann has issued a Yellow weather warning for Limerick, predicting there could be up to 35mm of rainfall by 6am tomorrow.
It is warning there is a risk of heavy, thundery showers today and tonight which may lead to localised flooding.
Motorists are being warned to be careful with AA Roadwatch warning of flash flooding in several parts of Limerick city and county.
There have been a number of minor road collisions this morning including two on the M7 motorway. Large tailbacks have been also reported on the Limerick side of Adare due to severe flooding.
In addition, several hundred homes are without electricity following an outage in the Cappamore and Pallasgreen areas.
ESB Networks says it hopes to have power restored later this afternoon.