Rainy weather is on the way, forecasters say (Image: PA)
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Brits face a final day of sunshine before wild weather batters the nation as thunderstorm warnings are issued.
Highs of 24C are expected on Tuesday after Monday saw the hottest day of the year so far.
And while temperatures are expected to remain above 20C in parts on Wednesday, a yellow thunderstorm warning also comes into force.
The Met Office said storms are "likely later" in the south.
The weather service's warning remains in place until Saturday, with it feared flooding could happen in parts.
Forecasters have also warned that travelling conditions may be difficult and isolated communities could be cut off.
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Brits have enjoyed stunning weather in recent days
Brits have enjoyed a prolonged period of warm weather, with the mercury regularly reaching the high-20Cs in places.
But reports say up to a month's worth of rain could fall on Wednesday, with up to 60mm possible.
Met Office forecaster Steven Keates said there will be a "big temperature contrast" in areas north of Yorkshire compared with much of the county and areas further south.
Brits have basked in the sunshine in parks and on beaches
(Image: AFP via Getty Images)
Temperatures of up to 30C are predicted in London, 24C in Cardiff and 18C in Edinburgh, due to a warm front covering the southern half of the nation.
Mr Keates said: "It looks like the full force of the heat is going to come back on Wednesday for southern and central England, Northern Ireland and Wales.
"There's a chance that Wednesday could become the hottest day of the year.
"But there's a big temperature contrast across the North West versus the South East."
The Met Office said outbreaks of rain are likely in the coming days
Monday's record-breaking weather for the year saw crowds flock to beaches and beauty spots.
The UK's previous high of 2021 was 28.3C in Northolt, north-west London, on June 2.
But this was smashed by a high of 29.7C in Teddington, Middlesex.
Mr Keates added the sweltering start to the week will be followed by "three potential rounds of thunderstorms" moving from Europe on Wednesday night, and again on Friday and Sunday.
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And the Met Office said of the storms: "There is some uncertainty in storm coverage, particularly western extent, but where they do develop torrential rain, intense thunderstorms, hail and frequent lightning are all possible.
"Rainfall totals of 20-40 mm, perhaps 60 mm in a few areas, are possible in 12 hours.
"With the most intense storms, 30-40 mm could fall in an hour or two. The storms should clear into the North Sea during Saturday morning."
The average monthly rainfall for June for England is 62 mm and for England South East and Central South it is 51 mm, a spokesperson added.
Check out the full Met Office forecast below:
Wind and rain are forecast for the end of the week
(Image: NurPhoto/PA Images)
Cloud in southeast England should thin, leaving much of England and Wales quite sunny and warm. Northern Ireland and Scotland cooler and turning cloudier, with rain and strong winds reaching some northwestern parts.
Rain in western Scotland easing and sinking south, clearer weather following but with scattered showers across far northwest where remaining windy. Fine and warm across most SE areas of UK.
Outbreaks of rain and coastal fog northern and western England and Wales. Sunny spells elsewhere, with isolated showers in northwest. Very warm across southern UK with thunderstorms likely later.
Outlook for Thursday to Saturday:
Sunny spells and a few showers affecting Northern Ireland and Scotland. Areas of thunderstorms likely to affect parts of England and Wales at times with temperatures returning to nearer normal.