A status orange rain warning has been issued for four counties.
The alert is in place in Longford, Leitrim, Cavan and Roscommon until 6pm this evening, with 50 millimetes of rain possible - which may lead to some flooding.
Seperately, a status yellow thunderstorm is in effect across 25 counties on the island, which runs until 9 o'clock tonight.
Met Eireann is forecasting heavy downpours of rain, and a chance of localised flooding.
Weather warnings
Status Orange
Rainfall Warning for Longford, Cavan, Leitrim and Roscommon pic.twitter.com/hKg0iRddwc— Met Éireann (@MetEireann) June 15, 2020