The Met Office in the United Kingdom has issued an extreme weather warning for Sunday, as temperatures climbed to 32C on Monday.
The rare amber alert covering much of England and Wales is used to warn people of potential health and transport issues caused by the heat.
It comes as Wales had its hottest day of the year with 28.7C in Cardiff’s Bute Park.
Northolt, west London, recorded a high of 32C as temperatures in England soared.
And Heathrow airport, in west London, recorded temperatures of 31.8C.
The airport previously was the site of the UK’s hottest day so far this year on 17 June when it was 32.7C.
The Met Office’s extreme heat warning has only been issued twice before.
It comes as a teenager is believed to have died after getting into trouble while swimming in a canal, near Wakefield in West Yorkshire.
The Met Office is advising people to stay indoors where possible and to drink plenty of fluid to cope with the heat.
Parents are also being encouraged to limit their children’s exposure to the sun.
Level three heat-health alerts, which are separate to the Met Office amber warning, are in place across the south, the Midlands and eastern parts of England.
The heat-health alerts, issued jointly by the UK Health Security Agency (UKHSA) and the Met Office, are expected to stay in place until next weekend.
On Monday, Aboyne in the Highlands hit highs of 27.5C, while Armagh reached 24.2C.
Sweltering temperatures are also affecting the north of England, with Manchester set to reach a high of 28C.
A heatwave is sweeping across Europe, with a plume of hot air coming up from Africa and northwards through Spain.
Temperatures are expected to hit 38C in Madrid and 47C in Seville on Monday.
France, Germany and Italy could see the heat exceed 40C over the coming weekend.
Weather forecasting models suggest it is possible – though not likely – temperatures in the UK on the weekend could reach 40C (104F).
But a Met Office spokeswoman said it did not believe the warmest weather would reach 40C – UK temperatures have never reached that point.
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