Tomorrow could be the hottest June day for 62 years due a 'tongue of fire' from Europe's record-breaking heatwave.
The mercury could reach as high as 35.6C on 'Scorching Saturday' - sparking the biggest beach and barbecue rush of the year.
The UK will be hotter than the Caribbean and Hawaii as the 1,500-mile wide heatwave nudging France's 44.1C (111F) temperature record extends to Britain.
The Met Office say there is a 50/50 chance of Saturday breaking June's 35.6C UK record, set on June 29, 1957, in London, and June 28, 1976, in Southampton.
Met Office records began 178 years ago in 1841.
Between London and Lincolnshire will be hottest, but even places as north as York are set for 32C.
As many as 150,000 beach visitors are expected at Brighton on Saturday, with 75,000 in Bournemouth, 75,000 in Great Yarmouth and 50,000 in Blackpool.
Day-trippers will clog roads with traffic jams due on coastal routes including the A23 to Brighton, A31 to Dorset, A30 to Cornwall and M55 to Blackpool.
Tesco's weekend sales are expected to total 500,000 packets of sausages, 250,000 tubs of ice cream, 200,000 ice lollies, 2.5million cans and bottles of beer and 2million bottles of wine, sales trends showed.
Glastonbury fans faced heatstroke as temperatures pushed the festival's 31.2C record, set in 2017.
The European heatwave's high-altitude air pressure – a measure of its strength – is the highest since records began in 1943 in Switzerland, European weathermen said.
The Weather Outlook forecaster Brian Gaze said: “A tongue of fire is extending from the continent to Britain, with highs up to 35C possible on 'Scorching Saturday' after a 'Frazzled Friday' for many.”
Met Office forecaster Nicola Maxey added: “There's a 50 per cent chance of Saturday seeing over the 35.6C June record, most likely between London and Lincolnshire.
“Even York could see 32C. Friday had Glastonbury close to its 31.2C record.
“There's remarkable heat across many parts of Europe, with highs in the 40s and records being broken.
“Saturday in the UK will be hot and sunny with very high UV, so take precautions, drink plenty of water and stay in the shade if you can.
“It's cooler on Sunday in Atlantic air, with 26C highs.”
Met Office forecaster Bonnie Diamond said: “A pulse of air is coming from the continent, with a southerly wind flow and the focus of the highest temperature is shifting to the east of the UK."
