The UK Health Security Agency has issued an amber warning until 9pm on Sunday in nearly every area of England.
The journalist came under criticism for flying the 1,800-mile round trip to Murcia in Spain to present a report on BBC News explaining the rise in temperatures across Europe was partly due to carbon emissions.
As wildfires rip through Europe and scientists warn of the hottest every year, Yahoo News looks at the recent trend of temperature rises.
Southern Europe and the south west of the US are in the middle of an intense period of extreme heat - but which location has the record as the hottest ever?
The Cerberus heatwave could break Europe's temperature record any day.
The heatwave - named after the three-headed monster from Greek mythology - is expected to escalate above 40c, with temperatures expected to climb as high as 48C on the islands of Sicily and Sardinia.
Sunday was the joint hottest day of the year so far, with temperatures reaching 32.2C in Coningsby, Lincolnshire
The South East is in line for another heatwave this weekend as temperatures soar again.
Many parts of the UK are experiencing a heatwave, or three days of consecutively high temperatures, the Met Office has revealed.
The warm weather is here to stay as many parts of the UK experience a heatwave, but how hot is too hot for you?
Brits have been urged to remain 'vigiliant', as some areas remain under drought status since last summer's record breaking heatwave.
The musician and environmental activist said he will donate £1,000 to charity if water boss Lawrence Gosden accepts his dare.
The hot weather has exposed the secrets previously hidden in Britain's reservoirs.
The Met Office has issued a yellow weather warning for thunderstorms for the whole of the UK.
People were evacuated from the beach at Studland, Dorset, because of the huge fire.
Some antidepressant drugs can prevent people from regulating their body temperature properly.
The TV presenter vented his frustration on Twitter when he was told to delay his harvest amid the heatwave.
Fire chiefs have advised people not to have barbecues in the warm weather.
The Amber grading warns of adverse health effects for the general public, not just the most vulnerable to extreme heat.
Much of the country sweltered under extreme temperatures with danger-to-life warnings in some parts of the UK.
After the UK's temperature record was smashed last week, climate change was at the forefront of weather reporting.
The TV presenter said the solution to the heatwave is to drink more beer.
Heatwave sweeping southern Europe heads to the north of the continent, with authorities declaring national emergencies.
The schoolboy went missing after jumping into the River Tyne near Ovingham, Northumberland, on Sunday afternoon.
The UK's temperature record is likely to be broken.