It beats the previous record from 2006.
Dublin has recorded its all time highest temperature, right now it's 33 degrees in the Phoenix Park.
That beats the previous record of 31 degrees, recorded in July 2006 in Casement.
Nationwide, it's Ireland's second highest temperature on record.
Met Éireann has said the mini heatwave will end tonight, with temperatures dipping back down again this week.
A yellow warning will last until midnight but Leinster will remain under the alert until tomorrow evening.
Darren O'Connor, from Dublin Fire Brigade, says even with cooler conditions, the risk of wildfires remains extremely high:
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