The interim Chief Medical officer is warning of the health risks around the hot weather.
Professor Breda Smyth is reminding people of the signs of heat exhaustion which include headache, dizziness, fast breathing or pulse, and being very thirsty.
Met Éireann has issued an alert for high temperatures in Leinster and Munster from tomorrow.
It'll reach 27 to 29 degrees during the day, and won't drop below 15 degrees at night-time.
Meteorologist, Joanna Donnelly, says it's set to be uncomfortably warm at night:
"We're just not acclimatized to those soaring temperatures here in Ireland. Close your curtains and your windows, the bedroom windows in the bedroom coursing through the day and try to keep the temperature in the bedrooms and sleeping rooms as low as possible."
