The UK's temperature record could be "obliterated" with sweltering highs of 43C predicted this week.
Brits have already been sunning themselves this weekend and making the most of the scorching weather.
But it may get hotter still with the mercury set to hit a massive 4C higher than the top recorded temperature next weekend.
At the moment the UK's temperature record is 38.7C, set at Cambridge Botanic Garden back in July 2019.
Experts have issued urgent health warnings as the Met Office said the hottest day could fall next Sunday.
Met Office forecaster Steven Keates warned that the warmest weather is still to come, telling The Sun : “We’re in for a real rollercoaster which may take people by surprise.
“Next weekend we could have some really exceptional record-breaking heat and it will ramp up suddenly - like someone has turned on the gas.
“Some models from America indicate we could see 43C in East Anglia next Sunday, which would obliterate the current UK record."
On Friday, the UK Health Security Agency (UKHSA) and the Met Office issued a level 2 heat-health alert for the South West, East Midlands, West Midlands, North West and Yorkshire and the Humber regions.
A level 3 alert was then also been issued for the East of England, South East and London regions.
Both alert levels are currently in place from 9am on Monday until 9am next Friday, with sizzling weather forecast across the country throughout the course of next week.
Some parts of the UK have been basking in temperatures close to 30C today, but things could still get hotter over the course of the next few days.
Dr Agostinho Sousa, Head of Extreme Events and Health Protection at UKHSA, said: "Heat-health alerts have now been issued to the majority of the country, with temperatures set to remain consistently high throughout the duration of next week.
"Most of us can enjoy the hot weather when it arrives, but it is important to keep yourself hydrated and to find shade where possible when UV rays are strongest, between 11am and 3pm.
"If you have vulnerable family, friends and neighbours, make sure they are aware of how they can keep themselves protected from the warm weather."
When out and about, it's important to look out for those who may struggle to keep themselves cool and hydrated, with older people, those with underlying conditions and those who live alone particularly at risk.
It's also vital to drink plenty of fluids and avoid excess alcohol, as well as trying to keep out of the sun between 11am to 3pm when the UV rays are strongest.
