With temperatures of 29C (84.2F) possible on Monday, weather forecasters predict this Bank Holiday will smash records.
"It has just reached 24.7C in Gosport in Hampshire beating the previous record set back in 1999".
"Fortunately there's still a lot of sunshine in the forecast".
There will be plenty of sunshine with light winds with highs of 28C, possibly 29C in London.
"The peak this weekend will be Monday where somewhere in the south of England will hit 27C or 28C which will mean it will be the hottest May Day Bank Holiday Monday on record, and as that was 23.6C then it should easily be reached".
Looking at the long-range forecast, the Met Office forecaster Charlie Powell said: "It looks like we should be prepared for some pretty changeable weather throughout the second half of May".
The South East and central southern England enjoyed the best of the sunshine, with most of the United Kingdom experiencing temperatures between 23C (73.4F) and 27C (80.6F).
The Met Office forecaster Greg Dewhurst said: "We have smashed the warmest bank holiday Monday for early May". Parts of the far north and northwest of Scotland will be cloudier at times with the chance of some rain, and it will be misty and chilly around some Irish Sea coasts.
The RAC predicts 1.91 million vehicle journeys on Monday will be made with traffic expected to peak between 10am to 4pm.
"But I think we can expect things to be not as warm as they are now".
He said: 'It should be a relatively easy journey in terms of the impacts from weather'.
The average high for the May Bank Holiday in London is about 18C.
The South East, East Anglia and the Midlands are expected to see some of the warmest temperatures on Monday 7 May. "This is most likely to happen in the south".
"After a scorching couple of days, the odds suggest this month could now end as the hottest May ever in the UK". Temperatures peaked yesterday at 26.3C at Heathrow.