Today will see the mercury rise to 25C, with it climbing to a potential 28C in some places on Monday.
The soar in temperatures would make it the hottest early May Bank Holiday Monday in 40 years - since the extended weekend was introduced in 1978.
By Monday, temperatures in South East England could reach 82F (28C), higher than on the French Riviera, Southern Spain or even Morocco.
Anthony Smith, chief executive of the independent watchdog Transport Focus, said: "Passengers will rightly be frustrated to find they can't travel on the bank holiday weekend".
And according to forecasts, today could be even warmer.
"There's also a 30 per cent chance that Monday will exceed 28.6ºC to be the warmest day recorded over the whole Saturday to Monday early May Bank Holiday weekend".
The forecaster also indicated high UV and pollen levels for the region.
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"We expect to see temperatures ranging from the low to mid 20Cs quite widely and all it will take is a small nudge in the right direction to reach the 30C-mark".
The record highest temperature for May is 32.8C (91F) which was recorded in 1922 and 1944.
Looking at temperatures for Bank Holiday Monday, the forecaster said the highs of 28C were not going to be widespread. However, coastal areas will be a little cooler with an onshore breeze.
On Monday, temperatures are expected to hit 27C across some parts of the UK.
Met Office meteorologist Helen Roberts said the high pressure over Britain and a "plume" of tropical air from the Continent was responsible for delivering the summer-like weather.
Scotland wasn't the only part of the United Kingdom to benefit from blue skies, with temperatures reaching 20.8C in Katesbridge, Northern Ireland, 23.6C at Powys in Wales and 25.6C in London. A fine day follows, with warm sunny spells and just occasional cloud.