Temperatures are expected to remain in the mid 20s for the weekend.
A status yellow thunderstorm and rain warning has been issued for this afternoon and evening by Met Eireann.
Counties most at risk are Wicklow, Kildare, Laois, Offaly, Tipperary, Clare, Galway, Mayo and Roscommon.
Meanwhile, temperatures are expected to remain in the mid 20s for the weekend.
Met Eireann forecaster Matthew Martin says people in the East are likely to be the first to experience cooler weather
Drivers and motorcyclists be aware of the risk following heavy downpours of rain forecast following the dry spell.
— Kildare County Council (@KildareCoCo) July 23, 2021
A build-up of oil and rubber develops on the road, when the weather breaks, this deposit when mixed with rainwater, results in greasy road surface. #RoadSafety pic.twitter.com/1nTfmqp2Fg