People are being warned to take extreme care as temperatures reach up to 29 degrees today.
14 counties come under a yellow warning for high temperatures from midday.
That will be extended to Sligo, Leitrim, Donegal and the rest of the country tomorrow, while the Department of Agriculture has issued a red warning for extreme risk of gorse and forest fires until next Monday.
Alan O'Reilly from Carlow Weather says it will become even hotter on Saturday and Sunday.
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