Met ÉIreann have issued some handy tips and tricks to the public to help out on Wednesday, as parts of the country will see temperatures hit 27C.
The national forecaster has already put a high temperature warning in for Munster and Leinster which is set to kick in on Thursday, but Wednesday will also be a bit of a scorcher in parts of the country.
It comes as an overall advisory for warmer conditions remains in place, having been introduced on Sunday - that's set to go until Monday morning at the earliest.
And while things won't get as uncomfortably warm as 29C today, there's still some care needed, particularly if you're in three counties.
Cork, Carlow and Kilkenny will get the best of things on Wednesday, according to the latest Met Éireann map.
Parts of the Rebel County will top the charts with 27C, with those conditions being mirrored in the two Leinster regions.
Other areas like Waterford, Kerry, the midlands and parts of Meath will suffer through with 26C heat.
Paul Downes, Meteorologist with Met Éireann, explained: "For the first time this summer we can say with a high degree of confidence that heatwave criteria will be met in some parts of the country.
"Unfortunately there have been a number of water related fatalities this year, and it is therefore paramount that water safety is at the forefront of our minds when it comes to enjoying the warm conditions, or seeking relief when it gets too hot.
"Please follow water safety guidelines and be vigilant of those around you. Check the latest sea area and inland lakes forecasts here.
"With ground conditions becoming very dry over the course of the summer, water tables are low and water should be conserved where possible. So try and only use water where necessary and avoid wastage.
"With the very dry conditions and the gradual increase in temperatures exacerbating that, fire risk will be high so always make sure to properly extinguish barbeques, and avoid lighting open fires in wooded or grassland areas"
Met Eireann has warned that the rising heat may lead to heat stress, especially for the more vulnerable of the population, high solar UV index and risk of water related incidents.
The warning will come into effect at 12pm Thursday and will remain until 6am on Sunday.
