A Status Yellow warning for rain will bring heavy spells to Cork and Waterford overnight.
Met Éireann is warning of spot flooding, poor visibility and difficult travelling conditions.
A yellow alert has just come into effect for Cork and will last until 8 am Friday while in Waterford, the warning will run from 6:00 pm on Thursday until midday Friday.
Heavy rain will push into Munster and parts of Connacht through the afternoon and evening with spot flooding possible near the south coast
It will be blustery with moderate southeast winds increasing fresh to strong and gusty. Highest temperatures of four to eight degrees.
On Friday, it will start wet and blustery with widespread rain, heavy at times in the south with possible spot flooding. The rain will slowly clear from the west and southwest with sunny spells developing.
It will be cool in the east and north with the highest temperatures of four to eight degrees, but milder in the south and west with highs of eight to 12 degrees.