A blast of warm air coupled with clear skies over Britain will bring temperatures more akin to Mediterranean resorts by the end of the weekend as England's first game in Euro 2020 gets underway.
In a small consolation following the closing of the remaining holiday route to Portugal for fed-up Britons, a mini-heatwave could make Sunday the hottest day of the year so far.
After cloudy skies put paid to a glimpse of yesterday's partial solar eclipse for many, temperatures could reach 86F (30C) in the South East, making parts of England warmer that the Algarve or Corfu.
It comes as the Euro 2020 football tournament kicks off one year late tonight, with Turkey v Italy in Rome - before the first match in Britain is held on Sunday at 2pm as England face Croatia at Wembley Stadium in London.
And UK beaches and beauty spots are set to be swamped with day-trippers, while world leaders and their protection teams gathering in Cornwall for the G7 summit are set for a sticky weekend.
The Queen will meet President Joe Biden and his wife Jill as temperatures soar to the hottest so-far on Sunday, after celebrating her official birthday in sweltering conditions with a scaled-down Trooping the Colour ceremony at Windsor Castle tomorrow.
Covid guidelines will be followed during the 'mini' event which will incorporate many elements of the annual Queen's Birthday Parade - as Trooping the Colour is also known - normally staged in central London.
But all good things must come to an end, and the renewed sunny spell looks like it will be short-lived, with the prospect of rain returning by next Thursday.
A cloudy but warm start to the day in London today with the City's skyline seen from Waterloo Bridge this morning
A cyclist makes their way along the South Bank in London this morning as the capital enjoys another warm day today
England will play Croatia in their first match of Euro 2020 on Sunday at Wembley Stadium in London, pictured yesterday
'The weekend will certainly be on the warm side as a result of high pressure building up, with temperatures increasing through Sunday and into Monday,' Met Office forecaster Greg Dewhurst said.
So far this year the UK's warmest day was June 2, set in Northolt, West London at 82.9F (28.3C).
'There's certainly a chance that figure could be beaten,' Mr Dewhurst added.
'But as we go into next week temperatures will be moving back down again with freshening wind and a risk of rain coming in from the north and west.'
The sweltering weekend will be welcomed by Britons eager to escape a months-long lockdown - which is expected to end on the June 21 'Freedom Day'.
Temperatures will soar as thousands tune into the Euros from tonight, and gather to watch a scaled-back Trooping of the Colour at Windsor on Saturday.
Temperatures will get above 70F (21C) in Britain for the 16th day in a row
Maximum temperatures in Britain will get above 70F (21C) for the 16th day in a row today. Here are the UK highs for the previous 12 days, including the hottest day of the year so far which was recorded last week:June 10: 76.5F (24.7C) - Heathrow Airport, LondonJune 9: 79.5F (26.4C) - Hull, East YorkshireJune 8: 76.6F (24.8C) - St James's Park, LondonJune 7: 76.3F (24.6C) - Coningsby, LincolnshireJune 6: 74.1F (23.4C) - St James's Park, LondonJune 5: 75.2F (24C) - St James's Park, LondonJune 4: 70.2F (21.2C) - Fyvie Castle, AberdeenshireJune 3: 76.5F (24.7C) - Santon Downham, SuffolkJune 2: 82.9F (28.3C) - Northolt, London - 2021 HIGHJune 1 : 79F (26.1C) - CardiffMay 31 : 77.2F (25.1C) - Kinlochewe, HighlandsMay 30 : 75.2F (24C) - Achnagart, HighlandsMay 29 : 73.2F (22.9C) - Chivenor, DevonMay 28 : 71.8F (22.1C) - Achnagart, HighlandsMay 27 : 71.6F (22C) - Wisley, Surrey
The last day the maximum was below 70F (21C) was May 26 when Killowen in County Down got to 65.5F (18.6C).
The royal event, marking the Queen's official birthday, will feature troops who have played an integral role in the NHS's Covid-19 response and those who have been serving on military operations overseas.
Buckingham Palace said: 'The parade will be led by the Foot Guards, who will be joined in the Quadrangle by the King's Troop Royal Horse Artillery and the Household Cavalry Mounted Regiment.
'Music will be played by a Massed Band of the Household Division, which will include 1st Battalion Scots Guards Pipes and Drums.
'Upon the Queen and the Duke of Kent's arrival in the Quadrangle, Her Majesty and His Royal Highness will be greeted by a royal salute, and the National Anthem.
'The parade will commence with the Musical Troop as the band plays.
'The Colour will then be trooped through the ranks, and the parade will conclude with a second royal salute.'
Although the Queen's 95th birthday was on April 21, Trooping the Colour always takes place in the second weekend in June.
It is traditionally delayed because the weather is nicer in early summer.
The busy weekend will also see the Queen meet with President Biden and First Lady Jill Biden following the G7 summit in St Ives, Cornwall, on Sunday.
Speaking yesterday, Mrs Biden said she and Joe were both looking forward to their meeting with the monarch, adding: 'That’s an exciting part of the visit for us. We’ve looked forward to this for weeks and now it’s finally here. It’s a beautiful beginning.'
Ahead of the weekend, maximum temperatures in Britain will get above 70F (21C) for the 16th day in a row today.
And while tomorrow will remain balmy, temperatures are set to dip nearer the mid-70Fs (mid-20Cs) which means the Met Office does not currently expect to declare an official heatwave.
That would require three consecutive days over a given threshold, currently 81F (27C) in southern England and 77F (25C) in the North.
Nevertheless the warm spell sparked a wave of excitement among bookmakers, with Ladbrokes slashing odds to 1/3 on this month going down as the hottest June ever.
Coral were also offering odds of 1/6 (from 4/5) on 86F (30C) or higher being recorded in the UK before the end of the weekend.
Yesterday morning, some skygazers across the UK were treated to a rare celestial show as observers witnessed a crescent sun during a partial solar eclipse.
Despite cloudy skies, astronomy enthusiasts were able to see nearly a third of the sun being blocked out by the moon.
Parts of the US, Canada, Europe and Asia witnessed an annular eclipse - where the sun appeared in the sky as a very bright ring, or annulus, in a phenomenon dubbed the 'ring of fire'.
Observers in the UK and Ireland saw a crescent sun instead of a ring, as this was a partial eclipse.
The phenomenon began at 10.08am UK time, reaching maximum coverage at 11.13am, before ending at 12.22pm.
The next solar eclipse will take place in October 2022, and will be visible across Europe, north-east Africa, the Middle East, and West Asia.