The roasting weather system moving in from the south means Brits will be faced with scorching hot days and equally muggy nights.
Temperatures will climb throughout the week, potentially reaching record-breaking levels by Thursday evening.
In the central and eastern parts of England, heatwave thresholds are expected to be met as high temperatures persist for three days or more.
The temperatures will remain high overnight into Wednesday, making it uncomfortable to sleep with overnight temperatures of 24C (75.2F).
Marco Petagna, Met Office forecaster said: “On Thursday we’ll see an east and west split with showers in the western parts of England but the eastern parts will look very hot with 36C to 37C (96.8F).”
“A toxic cocktail of hot humid weather and rising pollen levels this week could be extremely hazardous for the 5.4 million people in the UK with asthma”
Dr Andy Whittamore
He added there is a “60% chance” Thursday’s weather might surpass the current July record of 36.7C (98.06F) set at Heathrow in 2015.
There is also a “30% chance” of going over the all-time UK temperature record of 38.5C (101.3F) which was recorded in Faversham in August 2003.
Thundery showers are expected to hit Bristol in the late hours of Tuesday evening and the early hours of Wednesday morning.
Despite the moody and cloudy atmosphere, temperatures are still expected to be fairly high during the day with a potential 25C (77.6F).
Glasgow will experience heavy showers in the early morning which will later change to a cloudy atmosphere in the late morning.
Mr Petagna warned that “anywhere across England could see some thundery showers”.
He added the coolest areas will be in western England, “the temperatures will still be in the 20s so still fairly sunny but this part of England will be the coolest out of the rest”.
It comes as medical experts warned that the searing temperatures could turn fatal for millions of vulnerable Brits.
Health chiefs say that a toxic cocktail of hot weather and high pollen could be “extremely” hazardous for around five million people who suffer from asthma or have difficulty breathing.
Dr Andy Whittamore, clinical lead at Asthma UK and a practising GP, said: “A toxic cocktail of hot humid weather and rising pollen levels this week could be extremely hazardous for the 5.4 million people in the UK with asthma, triggering deadly asthma attacks.
“Hot air and hay fever can cause people’s airways to narrow, leaving them struggling to breathe, with symptoms like coughing, wheezing, a tight chest and breathlessness.”
He added: “Hot weather can also increase the number of pollutants, pollen and mould in the air which can trigger asthma symptoms.
“If you are worried about the weather or hay fever affecting your asthma, make sure you take your hay fever medicines, keep taking your regular preventer as prescribed by your doctor and carry your blue reliever inhaler at all times.
“We’d advise you to drink lots of water to prevent dehydration and plan any outdoor activities for earlier in the day when the air quality tends to be better.”
- Met Office
- UK weather
- Weather forecast
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