A status orange thunderstorm warning is currently in effect for County Waterford and will remain until 10pm.
Scattered showers and thunderstorms are said to intensify throughout the afternoon. There is also a risk of flooding.
Drivers are being urged to take care on the roads as the heatwave experienced this week officially comes to an end.
The showers will die out leaving a mostly dry night with clear spells.
Yesterday, temperatures rose to 30 degrees in what was one of Waterford's warmest days on record.
"As long as I'm recording data here in Waterford since 2010, I have never experienced such a prolonged spell of really, really hot temperatures," Michael Kelly of Waterford Weather said.
He also said that yesterday was the hottest day he ever recorded. He noted a temperature of 30.5 degrees in his station in the City.
Michael said that despite the weather warning, storms will be "hit and miss."
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