It was the same picture across the United Kingdom, with all four regions breaking their respective records, and comes on the back of NI's record-breaking Easter Sunday.
This was still shy of the top Easter Sunday temperature from 2011 when the mercury reached 25.3C (77F) in the Solent.
Temperatures soared to 24.2C in Kinlochewe, in Wester Ross, almost three degrees higher than the previous record, which was set at Culzean Castle in Ayrshire, in 2014.
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Other sweltering Easter weekend days include Good Friday in 2011 when 26.9C was recorded at London's St James's Park.
Scotland's record was broken on Sunday afternoon, with the mercury hitting 22.8C at Fyvie Castle in Aberdeenshire.
These beat the temperatures of 21.6C in Brynamman, Wales, in 1984, along with 20.7C in Aboyne, Scotland, in 2015, and 19.4C in Armagh in Northern Ireland dating back to 1924, which were the warmest Easter Sundays for those countries.
The odd sharp shower may develop in the South West later.
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Creed added: "High cloud for England and Wales meaning it could be hazy sunshine at times for the East though temperatures are still peaking".
"Thundery downpours are likely for Scotland on Wednesday night and through Thursday".
Meteorologist Dean Hall said that in "stark contrast" to the dry and sunny conditions in the UK, Spain and the Mediterranean are seeing showers and heavy downpours.
"We could still see more record-breaking temperatures tomorrow and on Easter Monday too".
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Yesterday was the warmest day of the year so far, the Met Office said, as temperatures hit 25.5C in Gosport, Hampshire, and millions enjoyed a "staycation".