The warmest early May bank holiday Monday so far was in 1999, when 23.6C was recorded.
Monday could be the warmest early May bank holiday on record, with temperatures expected to be in the region of 27C in the south east of England, according to the Met Office.
It comes as temperatures could reach as high as 28C in some parts of England on Monday as the three-day weekend concludes.
Central and south-eastern England will get the best of the hot weather across the whole weekend, but it will be warm for most in England and Wales, said meteorologist Sophie Yeomans.
'In Scotland there will be a band of rain but it will be still quite warm, the east will be sunnier than the west'.
He added: "Temperatures day by day are going to creep up". Highs of 23C on Saturday.
Showers will mostly die out tonight and it will become dry before gradually clouding over from the west with patchy rain and drizzle spreading from the Atlantic, accompanied by low cloud and mist, with hill and coastal fog in lowest temperatures of 4C to 7C.
This compares with highs of 20C (68F) forecast for Nice on the French Riviera on Monday; 22C (71.6F) in Malaga on the Costa del Sol; and 22C (71.6F) in Marrakech in Morocco.
"It's very, very likely we'll beat the 1999 record".
The RAC said the busiest period on the roads over the bank holiday will be Friday evening, with 2.86 million journeys predicted between 4pm and 7pm.
Betway's Alan Alger said: "It looks like we could be in for a period of sunshine over the bank holiday weekend and, of the main cities in the United Kingdom, it's London at evens that we expect to be hottest".
James Donohoe and Samantha Beck enjoying the good weather in Griffith park in Dublin.
Rail connections to the UK's busiest airport, Heathrow, will be severed on Sunday, when there will also be no trains serving London Paddington.