People enjoying the hot weekend out on the beach at Scarborough (Image: Peter Harbour – North Yorkshire Live)
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Brits are set to swelter on Monday as the Met Office predicts highs of 29C – making it the hottest day of the year so far.
Forecasters have said that the South East could see record-breaking temperatures as the week begins.
Sunday saw the mercury rise to 27.9C at Heathrow Airport, with sun-seekers heading to the nation's beaches and parks.
And pictures showed thousands in pub gardens and fans parks enjoying the heat as England beat Croatia in EURO 2020.
The hottest day of the year came on June 2, when 28.3C was recorded in Northolt, London.
And the Met Office is predicting even higher temperatures as the third week of the month begins – although rain is also on its way.
The weather service has issued a yellow thunderstorm for much of England from Wednesday, with a "small chance" of flooding.
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People enjoy the warm weather at the Porthminster beach in St Ives, Cornwall
Posting on Twitter, the Met Office said: "Monday will remain hot in the southeast with highs of 29C.
"Though it will be a cooler day for many northern spots."
But while temperatures will remain high as the week progresses, the threat of a thunderstorm begins to loom from Wednesday.
Forecaster Marco Petagna said: “Very warm but increasingly moist unstable air will reach the UK in midweek.
People paddle board along the River Cam in Cambridge on Sunday
"There is potential for significant thunderstorms in midweek as very warm air in place across the UK gets replaced by cooler Atlantic air from the west.
"The end of next week looks cooler with low pressure near the north of the UK."
It is though that up to 50mm of rain could fall over a three-hour period on Wednesday, with the Met Office issuing a warning so far in advance as they fear wild conditions.
The warning reads: "Some places are likely to see thunderstorms later Wednesday through to Friday with the potential for travel disruption and flooding.
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"There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail and strong winds.
"Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services."
The Met Office also warned of difficult driving conditions and some road closures and said there is a small chance that some communities become cut off by flooded roads.
Power cuts are also possible, it said.
Kids made the most of the weather over the weekend
(Image: Adam Hughes / SWNS)
Check out the latest forecast below.
This Evening and Tonight:
Rain moving southeast across northern areas, followed by clear spells and scattered showers. Central and southern parts dry with clear periods, but low cloud and mist affecting some western coasts.
Sunny and hot in southeast England. Band of cloud and some rain or drizzle over northern England and Wales sinking south and fading. Breezy with scattered showers in the north.
Outlook for Tuesday to Thursday:
Rain developing later on Tuesday across the northwest with sunshine and a few showers following. Becoming locally hot in the southeast by Wednesday but with thunderstorms then developing into Thursday.