Researchers at Maynooth University compared temperatures over the last 80 years and found record highs are increasingly likely.
A temperature of 33 degrees in Ireland has gone from a 1 in 180 year event, to 1 in 9 as a result of the changing climate.
Researchers at Maynooth University compared temperatures over the last 80 years and found record highs are increasingly likely.
The study also says 34 degrees in Ireland has gotten 28 times more likely since the 1940s.
Professor Andrew Parnell from Maynooth University says they health system needs to prepare for such events.
He said other countries have created little areas in local halls for people to cool down.
"Being ready for these things in advance would be extremely useful," he said.
Meanwhile, Met Eireann says last month was the coldest June since 2015.
It had an average temperature of 13 degrees - three degrees below last year which was the warmest on record.