Met Eireann has issued a weather warning for high temperatures.
The forecaster is saying Ireland will experience a hot spell from Sunday and into early next week.
Day time temperatures will widely reach the high twenties, possibly exceeding 30 degrees in some locations.
Met Eireann is warning it will remain uncomfortably warm overnight.
The warning is in place until next Wednesday.
Professor of Health Systems at DCU Anthony Staines has this advice:
"The W.H.O advice is which is pretty much the same as HSE's advice at the CDC, is keep cool. Wear light clothes. Stay indoors as much as you can keep a substantial fluid intake you should be drinking probably more than you think you need. Keep an eye out for people around you, keep an eye out for your neighbours. Keep an eye out for elderly relatives or people who have chronic illness.