Large parts of the UK are set to enjoy temperatures of up to 81F (27C) this weekend thanks to a weather phenomenon know as the Spanish plume.
Weather experts have warned that the conditions could have a massive effect on retail and catering.
The Spanish plume occurs when a gap between high pressure over northern Europe and low pressure over the Atlantic sucks hot air north from Spain and Africa across Britain.
Temperatures could start soaring from tomorrow and may even top the 82F (27.8C) seen on Easter Saturday.
Colin Occlusion, of the Weather Studies Unit at Maidenhead University, said: "This could have a serious affect on all aspects of life over the weekend.
"Restaurants should be prepared not to see any customers for dinner until at least 10pm - and they're going to be coming out in big family groups and they're going to want to stick around until the small hours.
"Don't expect to be able to get anything in the shops between around 1pm and 4pm on Saturday... everything will be shut for siesta.
"You should also be prepared to bump into blinged-up Brits wearing shell suits, football shirts and ill-fitting shorts when you're out in the evening - they'll bee pushing pushchairs along the streets and filling the bars."