Parts of the UK basked in what was the second hottest day on record as the mercury hit 37.7C, the Met Office said.
And while Northern Ireland may not have reached the same recording-breaking temperature yesterday, plenty of sun-seekers took to coastal hotspots to soak up the rays when the sunshine broke through cloudy spells as the mercury hit 24C.
Monday was the warmest day of the year here so far, with a temperature of 26.5C recorded at Killowen, Co Down.
In Britain, sweltering heat sparked speculation that the all-time UK record of 38.5C recorded in August 2003 could be broken - as well as prompting public health warnings urging people to stay hydrated and take shelter from the heat.
Experts explained the current heatwave is driving hot air from the south, but there is "no doubt" climate change is playing a role in the unprecedented temperature highs.
Elsewhere, Germany reached a new record of 41.5C yesterday, with other countries in continental Europe also facing all-time high temperatures.