Hundreds of schools will fully or partially close over the next few days because of the extreme heat.
A “heat-dome” settling over western Europe is forecast to bring temperatures near 40C by Wednesday, expected to surpass the record for June of 35.6C set in Hampshire in 1976.
The Met Office has issued a red weather warning for extreme heat, covering an area from London to Swansea and Somerset to Birmingham, from 9am Wednesday to 9pm Thursday.
Temperatures could also approach the UK’s all-time high of 40.3C, recorded in July 2022.
Met Office spokesperson Grahame Madge said 39C is expected to be the “headline maximum temperature on Thursday, most likely for somewhere in London or the South East”.
“It is possible we could see temperatures higher than the 39C if the final values are at the upper end of our narrow range.
“It is important to remember that the temperature value is only one element of this extreme heatwave story.
“The other major factor is the high humidity which for many will make the intense heat even harder to endure.”
The weather is also expected to cause major inconvenience to parents as schools shut or close early to protect children from the heat.
Some 100 schools in Somerset will be closed over the next three days, with the vast majority fully closed on Wednesday and Thursday, according to Somerset Council.
Around 100 schools will also be at least partially closed over the next three days in Buckinghamshire, along with 86 schools in Gloucestershire, according to council data.
Children at some schools have been told they can wear PE kit rather than full school uniform, which can involve long trousers and blazers.
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Bledlow Ridge School in Buckinghamshire said it was closing as its “classrooms do not have air conditioning, and indoor temperatures are likely to rise significantly above outdoor levels during very hot weather”.
Archway School in Gloucestershire said it could not “safely manage the expected extreme temperatures across the site”, adding that it was “concerned about the risks of travelling to and from school in these conditions”.
Overnight, the temperature did not dip below 20C at nine locations across England, recording what the Met Office class as a tropical night.
The hot weather led to thunderstorms and lightning strikes over England during the early hours of Tuesday.
The Met Office said on Tuesday morning that Somerset had “around 18,540 strikes in the past 24 hours”.
The London Fire Brigade (LFB) received 400 calls overnight, including two house fires believed to be caused by lightning strikes and flooding of homes.
There was also severe disruption across London’s transport network during Tuesday morning.
On the Elizabeth line, heavy rain caused flooding, disrupting services between Heathrow Terminals 2 and 3 and Heathrow Terminal 4.
Avanti West Coast said it planned to run fewer services than usual between Tuesday and Thursday, and that there was “a risk of further disruption”.
And Chiltern Railways said it had axed more than half its services over the three days “to ensure the safe operation of the railway”.
Meanwhile, Natural Resources Wales (NRW) said it had released extra water into the River Dee to help reduce the risk of fish deaths during the high temperatures.