The warmest day of the year was recorded during Twelfth celebrations on Saturday when the mercury hit a whopping 30C at Magilligan in Co Londonderry making it the hottest its been here since July 2022.
Sunday was slightly cooler with a maximum temperature of 27.1C in Castlederg, Co Tyrone.
People enjoy the sun at Helen’s Bay, Co. Down.
It’s expected to be cooler again on Monday as one of the biggest ever parades is set to get underway in Scarva, Co Down, with 82 marching bands taking part in the annual Sham Fight.
However it could still reach 20C as 85 Royal Black Institution (RBI) lodges join the procession.
“We could see a trend upwards in the temperatures once again as we head into the back end of the week” – Met Office
“The weather does change over the next couple of days becoming a bit more unsettled,” said a Met Office spokesperson.
“Showers move in tonight into tomorrow morning which could bring the odd rumble of thunder.
“Showers will remain through much of the day, mostly towards the west, but temperatures will start to feel a little cooler than in previous days.”
People in Bangor enjoying the sunny weather
It follows a blistering hot weekend where the sun attracted many visitors to the seaside.
Donaghadee pier was hiving with kayakers spotted around the harbour where daredevils dived into the water.
Others dabbled in a spot of fishing in the Co Down town.
Things were more relaxed around the coast in Bangor where passersby basked in the sunshine while taking in the sunning view while sun-worshippers gathered on the pier.
The bright spell looks set to end just as the 250,000 visitors begin making their to Portrush for the Open Championship this week.
The Met Office spokesperson said it will remain unsettled into Tuesday with more heavy showers and the risk of thunder and hail.
“Temperatures again a nudge down on the weekends,” they continued.
“Wednesday may be a little more settled with some drier weather, however we could see a trend upwards in the temperatures once again as we head into the back end of the week.”
People in Bangor enjoying the sunny weather
It comes after golfing superstars began arriving in Portrush for the first official day of Open preparation.
Scotland and Wales also recording their warmest day of the year so far on Saturday.
It reached 32.2C in Aviemore which was the first time temperatures exceeded 30C in Scotland since June 13, 2023 and only the seventh time since at least 1961 that the same high has been recorded in the country.
In Wales the mercury soared to 33.1C in Cardiff’s Bute Park beating the 2025 record set on Friday of 32.4C at the same location.
England was also hot, with maximum temperatures also hitting 33.1C in Ross-on-Wye in Herefordshire, however it did not break the country’s current record for the year which remains 35.8C as recorded in Kent at the beginning of July.
Met Office meteorologist Kathryn Chalk said the heat has peaked.
“So we’ve got this ridge of high pressure extending across the UK, helping to keep things settled, but out towards the west an area of low pressure moving through Sunday night and into Monday,” she explained.
“So if you’re not a fan of the heat temperatures will be falling away but also bringing some heavy spells of rain, or welcome rainfall, for many of us.”