It comes as smoke from wildfires in Spain and Portugal, plus Saharan dust, drifted over the UK which the Met Office said will bring “enhanced sunsets and sunrises in the coming days with deeper reds and oranges thanks to light scattering.”
On Hazelbank beach visitors splashed in the waves and soaked up the rays on Sunday.
Others flocked to local parks with many people choosing to unwind on the lawn at Belfast City Hall.
The region experienced its third heatwave of the year which sent temperatures soaring above 25C last Tuesday, Wednesday and Thursday.
The mercury dipped slightly as the weekend approached.
A high of 24C was recorded in Magilligan, Co Londonderry on Sunday.
It was slightly cooler (23.8C) on the Giant’s Causeway which was closely followed by Castlederg (23.5C).
Meanwhile Armagh enjoyed highs of 23.4C as the temperature at Aldergrove peaked at 22.9C.
While temperatures look set to remain below the heatwave threshold over the coming week, conditions are expected to remain sunny and warm.
Monday is forecast to get off to a misty misty start in the east before it clears away on what will be a dry, calm day with hazy sunshine.
Highs of between 20C and 23C are predicted.
“High pressure will keep it largely dry and settled for much of the week ahead,” a Met Office spokesperson said.
“Most days will see variable cloud, so spells of sunshine and winds will remain light. Temperatures are expected be near average.
“Perhaps starting a little above at around 23C on Monday then falling a little as the week goes on with Tuesday to Friday generally in the range of 18-21C.”
David Johnston and Gary Aitcheson pictured enjoying the nice weather at Hazelbank beach. Pic: Pacemaker Press.
It comes after NI Water issued a reminder for the public not to light barbeques or ignite outdoor open fires in beauty spots throughout the region.
A ban on such activity was introduced in May following widespread wildfires in the Silent Valley Mountain Park and remains in place.
The utility provider has also reminded the public that accessing water sites in the area is also prohibited.
NI Water Senior Facilities Manager Patricia McKee said: “We are reminding the public that we have banned all barbecues and open fires until further notice.
“If you see a fire, move to safety and phone the NI Fire and Rescue Service on 999. If you see someone deliberately setting fires, report it to the PSNI immediately as it is a criminal offence.
“It is important to remind anyone coming to our reservoirs that the lands around them are working sites and are therefore dangerous and not suitable for any water activities.
“These bodies of water can be deceptively dangerous, with strong currents, cold water shock and difficulty exiting the water.
“These are just some of the hazards that pose serious risks. We want everyone to stay safe and treat our waterways with respect by adhering to our safety signage on site.”
Smoke particles from wildfires is not expected to affect air quality, but will change colour of the sky through processes known as Rayleigh scattering and Mie scattering as sunlight bumps into tiny molecules of nitrogen and oxygen as it enters the atmosphere.