It's expected temperatures could get close to record breaking highs today or tomorrow.
Met Éireann is warning the mercury could reach the low 30s in a few inland spots, as a yellow high temperature warning for the entire country kicks in at midday.
A similar alert is already in place across Munster and Leinster.
Met Éireann say parts of North Cork will be the hottest in Cork with Fermoy expected to reach over 30 degrees later today
Climate scientist and weather analyst, Cathal Nolan, says it's rare for Ireland to get two very hot spells in a summer.
We're being reminded to take care of our skin and avoid burning in the hot weather conditions.
Dermatology nurse and skincare specialist, Selene Daly, says it's really important to apply sunscreen and to do it before you go outside.
