Wednesday has been the hottest July day EVER after the temperature reached 36.7C at Heathrow Airport, it has emerged.
That incredibly high temperature was recorded at 3pm.
Around four hours earlier the hottest temperature SINCE 2006 was recorded in Northolt, according to the Met Office.
Sweltering heat on Wednesday morning saw the mercury rocket to 34.5C in Northolt, while 34.1C was registered at Heathrow.
Then this happened:
The Met Office has warned that thunder storms could follow the extreme heat.
Deputy Chief Meteorologist, Laura Paterson said: "The very warm air means there is a risk of us seeing thunderstorms on Wednesday or Thursday but the exact timing and location of those storms, if they happen, is uncertain at the moment. "
While many people enjoy hot weather, high temperatures can be dangerous and Dr Paul Cosford, director for health protection at PHE said: "Older people and those with long-term illnesses are particularly vulnerable to the effects of very hot weather, so it's important to look out for them, help them stay hydrated with plenty of cool drinks, and keep indoor areas as cool as possible.
"Try to keep bedroom and living spaces cool, by closing the curtains on windows that receive the sun and open your windows at cooler times of the day and overnight. A trip to a park where there's lots of shade or a public building that is air conditioned, may help offer some relief from the heat for vulnerable people."
Temperatures are expected to dip slightly on Thursday, before rising again from the south later Friday and Saturday.
The Met Office said this could again result in thunderstorms breaking out, mainly in central and southeastern parts of Britain, though isolated storms can't be ruled out elsewhere.
Residents have been taking to Twitter as it got hotter and hotter in West London.