The mercury could hit 28C as people round off their three-day weekend - making it the hottest in almost two decades.
But that's just the start of a summer of sun, according to experts.
Barcelona is set to be just 70F (21C), while 73F (23C) is expected in Nice, on the French Riviera and in Malaga, on the Costa Del Sol, and 75F (24C) in Rome.
James Madden, forecaster for Exacta Weather, told Express.co.uk: "Currently June looks like starting on quite a warm and sunny note".
"But I think we can expect things to be not as warm as they are now, but also not as dry as they are now", he said.
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"Some of these warm to hot periods could become hampered by cloud cover at times giving a muggy feel to affairs and broken up by some thunderstorm activity".
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"We could see temperatures approaching the mid 30Cs across the southern half of the country".
Scots managed to enjoy some well-deserved sun as temperatures soared over the bank holiday weekend.
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The hottest early May Bank Holiday weekend recorded was 1995, with highs of 28.6C in Cheltenham, Gloucestershire.
On the first May bank holiday in 1999 temperatures peaked at 23.6C.
She said: We've got two records to break this bank holiday weekend.
Mr Snell said: "It looks likely we'll at least see our warmest Bank Holiday Monday on record on Monday".
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.
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Britain could be heading for the warmest May bank holiday on record, the Met Office has said. "28C is likely, and we could nudge closer to 29C".