The Met Office says the UK could enjoy its hottest day ever next week amid wild predictions of 43C temperatures.
Meteorologists gave a one in three chance of Britain beating its previous record of 38.7C, which was set in Cambridge in 2019.
Some reports have suggested Brits could swelter in 43C heat next Sunday, although the Met Office warned this exact figure is "very unlikely".
It comes as Brits flocked to parks and beaches across the country to bask in the sunshine of the latest heatwave.
Becky Mitchell, a forecaster for the Met Office told The Mirror: "It is quite unprecedented.
"There's a one in three chance we could see a record breaking temperature next week.
"The most likely outcome is we'll see temperatures in the mid 30s. There's a 30% probability we will get heat in the high 30s, which would break the UK's hottest temperature on record.
"Temperatures are likely to peak towards end of next week. There's lots different model outputs one or two are showing extreme temperatures like 43C.
"However, we are very unlikely to see 43C."
Ms Mitchell anticipated scorching weather across England and Wales next week, particularly on Sunday.
She said: "We are drawing up some hot air from Spain and France. That's the reason we could see these high temperatures.
"Many areas will reach 32C (next Sunday), while some will get to 35C.
"There's a small chance temperatures could go into the high 30s and a very small chance of 40C."
Some forecasters have warned that the predictions for next week's weather are 'unlike anything' they've ever seen before.
Sky News meteorologist Kirsty McCabe said: "Nobody can recall 40C appearing in a major global forecast system for the UK. Especially when this forecast was also predicting temperatures over 39C over a huge area of southeast England.
"Given that the UK's previous hottest days have only seen a few places exceed 38C, this was unlike anything forecasters had ever seen before."
BBC forecaster Jen Bartram tweeted: "With the extremely important caveats from last time (Ie this is one run of one weather model but not what most say and not expected) - the fact that 43° is being modelled at all for the UK… alarming.
"This model (GFS) has thrown it up extremely high temps for UK a few times now."
Experts have issued urgent health warnings ahead of the scorching weather.
On Friday, the UK Health Security Agency (UKHSA) and the Met Office put out 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.
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Scotland enjoyed its hottest day of the year today, with highs of 27.3C recorded in the village of Aboyne, the Met Office said.
Meanwhile, temperatures rose to 30C in parts of southern England.
