This picture taken on July 26, 2015 shows a child playing in a fountain on a square to cool himself amid a heatwave in Binzhou, eastern China's Shandong province.   CHINA OUT     AFP PHOTO        (Photo credit should read STR/AFP/Getty Images)
STR/AFP/AFP/Getty Images
This picture taken on July 26, 2015 shows a child playing in a fountain on a square to cool himself amid a heatwave in Binzhou, eastern China's Shandong province. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
Now playing
01:14
What NOT to do in a heat wave
American University of Beirut
Now playing
02:38
Picking up the pieces -- literally -- of Beirut's port blast
screengrab iran raisi
IRIB
screengrab iran raisi
Now playing
03:26
Iran's president-elect delivers first speech to supporters
Hong Kong Apple Daily close watson pkg intl hnk vpx_00022322.png
Hong Kong Apple Daily close watson pkg intl hnk vpx_00022322.png
Now playing
02:25
What a tabloid's fate says about a city's political future
CNN's Becky Anderson speaks with WFP executive director David Beasley about the situation in southern Madagascar.
CNN
CNN's Becky Anderson speaks with WFP executive director David Beasley about the situation in southern Madagascar.
Now playing
03:50
'I've never seen you this impassioned': CNN anchor reacts to UN agency chief's message
Iran's new President-elect Ebrahim Raisi speaks during a press conference in Tehran, Iran, Monday, June 21, 2021. (AP Photo/Vahid Salemi)
Vahid Salemi/AP
Iran's new President-elect Ebrahim Raisi speaks during a press conference in Tehran, Iran, Monday, June 21, 2021. (AP Photo/Vahid Salemi)
Now playing
02:28
CNN asked Iran's President-Elect about nuclear deal. Hear his reply
Now playing
02:15
See where Olympians will eat, sleep and relax in Tokyo
TABRIZ, IRAN - JUNE 16: Iran presidential candidate Ebrahim Raeesi takes part in a campaign meeting with Residents of Tabriz on June 16, 2021 in Tabriz, Iran. The country's incumbent president, Hassan Rouhani, is ineligible to run again after serving two terms in office. (Photo by Meghdad Madadi ATPImages/Getty Images)
ATPImages/Getty Images Europe/Getty Images
TABRIZ, IRAN - JUNE 16: Iran presidential candidate Ebrahim Raeesi takes part in a campaign meeting with Residents of Tabriz on June 16, 2021 in Tabriz, Iran. The country's incumbent president, Hassan Rouhani, is ineligible to run again after serving two terms in office. (Photo by Meghdad Madadi ATPImages/Getty Images)
Now playing
02:20
Ultra-conservative candidate wins Iran's presidential election
nigeria kidnapping explainer africa Asher pkg oneworld intl ldn vpx_00021802.png
nigeria kidnapping explainer africa Asher pkg oneworld intl ldn vpx_00021802.png
Now playing
02:20
'The stuff of nightmares': Breaking down Nigeria's kidnapping epidemic
screengrab china shenzhou 12 launch
CCTV
screengrab china shenzhou 12 launch
Now playing
01:59
See Chinese rocket launch to send astronauts to its space station
Putin praises biden Geneva summit Robertson lkl intl hnk vpx_00010025.png
Putin praises biden Geneva summit Robertson lkl intl hnk vpx_00010025.png
Now playing
02:09
Hear Putin offer rare praise for President Biden
Iran presidential election Pleitgen pkg intl hnk vpx_00021422.png
Iran presidential election Pleitgen pkg intl hnk vpx_00021422.png
Now playing
02:22
Hear from Iranian voters as they head to polls in presidential election
Host TV
Now playing
07:15
'What are you so afraid of?': Journalist presses Putin on political opposition
Russian President Vladimir Putin faces questions from reporters after his meeting with US President Joe Biden in Geneva, Switzerland.
Host TV
Russian President Vladimir Putin faces questions from reporters after his meeting with US President Joe Biden in Geneva, Switzerland.
Now playing
04:44
Putin faces question about cyberattacks against the US
CNN's Christiane Amanpour provides analysis following a summit between President Joe Biden and Russian President Vladimir Putin.
CNN
CNN's Christiane Amanpour provides analysis following a summit between President Joe Biden and Russian President Vladimir Putin.
Now playing
01:59
Amanpour: Biden did something very different than Trump
President Joe Biden meets with Russian President Vladimir Putin, Wednesday, June 16, 2021, at the 'Villa la Grange', in Geneva, Switzerland.
Patrick Semansky/AP
President Joe Biden meets with Russian President Vladimir Putin, Wednesday, June 16, 2021, at the 'Villa la Grange', in Geneva, Switzerland.
Now playing
02:55
Ward describes 'uncomfortable' photo op between Biden and Putin
CNN —  

The UK is set to sizzle this week, in a heatwave that could set new temperature records for July, a new all-time record and a new overnight record..

Temperatures across the country should build from Monday to a peak on Thursday, when the mercury could reach the mid- to high 30s Celsius, according to the Met Office national weather service.

“We’ve got a heatwave potentially happening this week, with temperatures building day on day,” a Met Office spokeswoman told CNN.

London and southeast England will be the hottest parts of the country, with temperatures as high as 34 degrees Celsius (93.2 degrees Fahrenheit) Tuesday.

The heat could continue to build in central and eastern areas, hitting 35 degrees Celsius on Wednesday and 37 degrees Celsius Thursday.

This would beat the July record of 36.7 degrees Celsius (98.1 degrees Fahrenheit), which was recorded July 1, 2015 at Heathrow, just outside London.

The map above shows maximum Thursday temperatures for major UK cities, rather than the hottest areas.

Temperatures that high would make Wednesday and Thursday the hottest days of the year so far in much of England.

And night won’t bring much relief. Forecasters say temperatures will stay high Tuesday night into Wednesday morning, with the potential for the July nighttime record and the all-time nighttime record to be broken.

“The highest minimum temperature is 23.9 (75 degrees Fahrenheit), that was recorded in Brighton on 3rd August 1990,” the Met Office spokeswoman said, adding that the July overnight record of 23.3 degrees Celsius (73.9 degrees Fahrenheit) was set in London in 1948.

“Potentially Tuesday night into Wednesday, we’re looking at possibly temperatures not going down to much below 24 degrees,” she said.

The overall temperature record for the UK – 38.5 degrees Celsius (101.3 degrees Fahrenheit) recorded at Faversham in southern England in 2003 – could also be at risk, the spokeswoman added.

“We’re certainly looking at a warm week across the country – the heat is quite widespread. You could see temperatures in the high twenties and low thirties quite far north as well.”

The heat wave is down to a weather setup that is broadly similar to the pattern that caused high temperatures in Europe in June, according to Paul Gundersen, chief meteorologist at the Met Office. But, he added, “conditions will feel much more comfortable for all by the time we get to Friday.”

France could also see record-breaking temperatures this week, with temperatures potentially hitting 44 degrees Celsius (111.2 degrees Fahrenheit), the Met Office said.

Temperatures in Paris are expected to top 40 degrees Celsius on Wednesday and Thursday, breaking previous records.

On Tuesday, Bordeaux and several other large cities in France set all-time temperature records, with some topping 40 C for the first time ever, according to Meteo France, the country’s weather service.

Many also set all-time records for the warmest low temperature of the day—a metric that suggests how dangerous the heat wave can be: When nighttime temperatures don’t fall or fall very little, buildings don’t cool down and people get no relief.

France was hit hard by the June’s heat wave, recording its highest ever temperature of 45.9 degrees Celsius (114.6 Fahrenheit) in Gallargues-le-Montueux in the Gard department in southern France, according to the French national weather service Météo-France.

CNN’s Brandon Miller contributed to this report.