"The London area will be warmest, with Sunday having a chance of 27C and Tuesday still at 26C, but even the North could see 25C on Monday".
"It'll be very warm again in the sunshine and we are expecting this to be the hottest early May Bank Holiday Monday on record; it's also possible that temperatures today will make it the hottest early May Bank Holiday weekend on record".
The hottest early May bank holiday weekend was in 1995 when temperatures hit 28.6C on the Saturday.
The heatwave is being caused by hot air arriving from 30C southern Russian Federation, the Met Office said - weeks after "Beast from the East" cold air from the same region froze Britain.
Temperatures are expected to soar to 28C in parts of England as the three-day weekend draws to a close.
Temperatures are predicted to reach as high as 29 degrees Celsius in some parts of England.
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Looking at the long-range forecast - not as accurate as the shorter range forecast - Met Office forecaster Charlie Powell said: "It looks like we should be prepared for some pretty changeable weather throughout the second half of May".
"Patchy fog and low cloud may affect some western coasts, where cooler".
Traffic spokesman Rod Dennis said: "Many people will still be keen to make the most of the early May warmth by escaping in the vehicle to spend time with family or friends especially after the recent chilly spell that even lead to some overnight frosts at the start of this week".
The May Bank Holiday was introduced in 1978 and the temperature has never topped the 28C mark since then.
The record for the early May Bank Holiday is 74.5F, set in 1999 in Martyr Worthy, Hants, and Worcester and Malden, both Worcs. "This is most likely to happen in the south". "The record high of 32.8C looks to be in danger of being broken", said Coral's John Hill.
Bookmaker Coral has cut the odds on this month seeing the hottest May day ever recorded to 6-4 from 2-1.