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.
Met Office weather forecaster Marco Petagna said: "Considering it is a bank holiday, we have been treated to a lot of glorious weather in most areas, with some potential record-breaking temperatures as well".
The Met Office says some patchy cloud will develop overnight, but with some clear spells too and brisk southeasterly wind along the east coast, with a minimum temperature of 7 °C.
"From Wednesday (April 17) temperatures will start to rise day by day and with the sun getting stronger at this time of year, it's going to feel warm or very warm by the time we get to Good Friday and Easter Saturday". But it did not rival the all-time high for Easter Saturday: 29.4C, recorded on April 16, 1949, in Camden Square, London.
This was still shy of the top Easter Sunday temperature from 2011 when the mercury reached 25.3C in the Solent.
MONDAY'S torrential rain will feel like a distant memory this Easter weekend as Ireland basks in a mini-heatwave.
However, Islington-based chocolatier Paul Young told The Daily Telegraph the barbecue-style weather didn't have an adverse impact on sales.
Met Office is forecasting sunshine and warm temperatures for the second day running in Portsmouth.
Thundery showers are predicted in the west of the country on Tuesday afternoon with cooler and cloudier weather along the North Sea coastline.
Bookmaker Ladbrokes has cut odds from 5/6 to just 8/11 for this year to see the hottest Easter Sunday on record. There are temperatures of 17C to 16C in Barcelona.
Met Office Chief Meteorologist, Frank Saunders, said: "Temperatures will reach into the low 20s quite widely and there's a good chance some places particularly in the south could see temperatures peaking around 24C to 25C".