Laois and Offaly are under the advisory until 6 tomorrow evening.
Eight counties are now under a status yellow high temperature warning.
Laois, Offaly, Kilkenny, Tipperary, Kerry, Limerick, Clare, and Galway are under the advisory until 6pm tomorrow.
Temperatures could exceed 27 degrees today and tomorrow, while night-time lows aren't expected to drop below 15 degrees.
Holly O'Neill from Met Eireann is warning people to be responsible in the sun:
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