Temperatures in London and the South East could top 33C, beating the current record held by Porthmadog in Wales on June 28.
While this will be good news for sun-worshippers and sports fans enjoying Wimbledon and the World Cup 2018, vulnerable groups are being urged to take precautions.
The Met Office and Public Health England upgraded its heatwave alert level to three on Thursday, just one step below ‘national emergency’ levels.
The mercury has either matched or surpassed 28C for 11 days in a row.
If the heat continues past 19 days, it will smash the previous heatwave record set in in August 1997, according to the Met Office.
When will it rain? Will it rain today anywhere in the UK?
Britain will continue to bake in hot and sunny weather today, although the Met Office says “one or two showers may develop later over southeastern England and perhaps Northern Ireland”.
Some showers may develop in the northwest of Scotland tonight and in the coming days, but the rest of the country will stay dry until mid July.
Weather forecaster Emma Salter said: “There’s no let up in sight in terms of the dry weather and high temperatures through the week.
“It’s pretty much dry across the board and no sign of rain.
“From Monday or Tuesday the really high temperatures will start to gradually come down, but it will still be in the high 20s so it will be ‘less hot’ rather than cooler.
“There will be some rain perhaps, but then it looks quite settled again through the rest of the month.”
A band of high pressure is still making its way eastwards across the Atlantic, bringing highs of 32C in London, 25C in Scotland and 24C in Northern Ireland on Saturday.
Will be there be more flash floods?
BBC weather forecaster Carol Kirkwood has warned of flash floods lashing parts of the south of England at the weekend.
She said: “Temperatures across the country will be in the high twenties, rising to 31C on Saturday and even 32C in the south east by Sunday.
“But there is the risk in Essex, in Kent and Sussex that we could see some torrential downpours.
“There could be showers, it could be thundery, they may lead to flash flooding like we saw in Tunbridge Wells yesterday.”
Flash floods in Kent, caused by sudden downpour on Thursday, brought traffic to a rinding halt as fast-flowing water swept through streets.
The Met Office said the flooding was caused by 20 minutes of rainfall between 4pm and 5pm on Thursday.
The weather forecaster’s outlook from Sunday to Tuesday is “largely hot with sunny spells and light winds but temperatures gradually falling from the north into next week where it will be cloudier and breezier at times with patchy rain”.
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