Individuals have been suggested to remain out of the solar, regardless of there being no warmth warning in place within the area.
The Met Workplace mentioned that by 4pm, a temperature of 30.5C had been recorded in Armagh, and 30.4C in Derrylin in Co Fermanagh.
The very best temperature ever recorded in Northern Eire was 31.3C (88.3F) in Castlederg in County Tyrone final July.
As folks flocked to seashores throughout Northern Eire, public transport operator Translink introduced that practice tickets to the favored Helen’s Bay in Co Down had been being suspended.
Dr Brid Farrell, deputy director of public well being on the PHA, urged folks to remain out of the solar in the course of the warmest hours.
She informed the BBC Good Morning Ulster programme: “What we’re recommending is that folks attempt to keep in cool areas or else keep cool by consuming loads of fluids.
“Specifically, we’d be eager that folks keep away from being outdoors between the hours of 11am and 3pm.
“Keep out of the solar, use sunscreen.
“Really we’re in a lucky place that we aren’t going to achieve the temperatures at present being seen in England, Wales and the south of Scotland.
“Extreme temperatures can impact outdated folks and younger youngsters extra severely so everyone ought to look out for them.”
Dr Farrell added: “We’re going to encounter extra extremes of climate, each very popular and really chilly within the subsequent couple of many years.
“That’s all because of local weather change.
“It’s one thing we now have to prepare for and be ready for and know what to do when the temperatures attain very excessive ranges.
“I believe for the following 48 hours we must always be capable to handle and well being providers will cope however for the longer term that is going to turn into an issue.”
Lifeboat and lifeguard providers are anticipated to be busy with households heading to the seaside to attempt to keep cool within the sunshine.
Carl Kennedy from the RNLI informed the BBC: “We’d count on right this moment to be a reasonably busy day for our lifeguards.
“We now have received wall to wall sunshine and there will probably be big numbers of households coming to be seaside right this moment.
“The lifeguard precedence is on folks within the water, so we will probably be maintaining a tally of folks and youngsters enjoying across the water.”
On Sunday RNLI lifeboat crew rescued 5 adults and 4 youngsters off the Co Antrim coast after their boat hit a submerged object and began taking over water.
The group was taken to Ballycastle Harbour the place they had been helped by coastguards.
Well being providers are additionally anticipated to be stretched in the course of the heatwave with the general public urged to name for an ambulance solely in an emergency.
The Northern Eire Ambulance Service mentioned it anticipated a rise within the variety of much less pressing calls it receives by means of the 999 system.
A spokesperson mentioned: “To assist us defend essentially the most susceptible, we’d ask that the general public solely name if an emergency, however to not hesitate to take action if obligatory.”
Animal welfare charity the USPCA has issued a warning to pet house owners in regards to the climate circumstances.
Colleen Tinnelly, USPCA growth supervisor, mentioned: “It’s essential that your pet has entry to a shaded relaxation space and has a continuing provide of unpolluted and funky water – your pet’s water dish must be refilled repeatedly with cooler water or ice cubes in the course of the day.
“It’s also possible to freeze some treats in your pet to take pleasure in – resembling carrot or apple bites, chopped watermelon and banana, or peanut butter which may be positioned inside toys and supplies nice enrichment for them.
“It may be very tempting to take our canine out with us on walks or household days out nonetheless this may be very harmful for them.
“One of the crucial necessary items of recommendation we may give members of the general public is to by no means go away them in a automotive.”