Met Éireann's issued a High Temperature Advisory with the warm weather set to continue into next week.
The advisory comes into effect from midday today and is valid until midday on Friday.
Temperatures reached 29.5 degrees in Athenry, Co. Galway yesterday, making it the hottest day of the year so far.
With temperatures exceeding 30° in Co. Down, the highest ever recorded in the North of Ireland.
Irish Water is urging people to cut down on their water usage as the utility is seeing a spike in demand during the warm weather.
It's recommending simple steps like shorter showers or reusing household water for the garden to help conserve supplies.
The utility company is also asking the public to report any leaks.
With the high temperatures expected to stay for the next week, people are being urged to be mindful of their pets in the heat.
Garda Dog Roxy & Bran having an early morning swim to cool down. Please remember dogs can't regulate their temperature so it's important not to allow them to overheat. Give them loads of fresh water and shade for a walk, perhaps better to do in early morning/evening. — Garda Info (@gardainfo) July 18, 2021
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The DSPCA is asking the public not to walk their pets in the middle of the day and keep the house cool for them.
The charity are also asking people to avoid bringing and of course leaving their pets in the car during the heatwave.