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:

Electricity Bills To Increase Next Year As Households To Shoulder Majority Of Power Grid Overhaul
Bus Éireann Confirms January Expressway Fare Increase, Cites Insurance And Fuel Costs
NTA Plans 24-Hour Bus Linking Newbridge, Naas And Dublin City Centre
Visiting Only Allowed For Critical Or Compassionate Reasons At Naas Hospital Amid Surge In Flu Cases
Turn2Me Reminds Locals Feeling Down Over Christmas Period To Avail Of Supports Available
Four Naas Car Parks Go Free For Christmas - But Illegal Parking Still Enforced, Says Council
Up to €400,000 Spent, Answers Yet To Be Published: Fianna Fáil TDs Demand Aras Bid Campaign Review
Family Member Questioned After Deaths Of US Filmmaker Rob Reiner And Wife