The status yellow high-temperature warning for Longford and 11 other counties has come into effect.
It'll remain in place until 7am on Sunday with highs of around 27 degrees, while it won't fall below 15 degrees at night.
Met Éireann is warning of uncomfortable sleeping conditions and heat stress.
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Meteorologist Aoife Kealy says cooler weather will move in over the next few days in some places:
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Former fire-fighter Micheál Frain, from Ballaghaderreen, says there's a high risk of a blaze in this weather:
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People are visiting various tourist attractions across the region during the warm spell.
General Manager at Lough Key Forest Park in Boyle, Dermot Beggan, says they're expecting a busy weekend:
