Meteorologists have predicted the return of tropical heat on Wednesday and Friday with parts of England and Wales expected to reach up to 30C.
See also: UK weather: Heatwave to hit Wimbledon
However, the barbecue conditions will be replaced by thundery showers due to hit the UK on Thursday.
Mark Wilson, a meteorologist from the Met Office, said: "It's going to be pretty warm across the south.
"We could see highs of 28C (82.4F) by Wednesday."
Wednesday and Friday are set to be scorchers across parts of England and Wales
And the "bulk of central and southern England and all of Wales" are due to get hotter before the end of the working week.
But the heat will not last long, as the same areas could be in for thundery showers on Thursday, before temperatures cool into the weekend.
However, Friday also has the potential to be another hot day, and temperatures could reach highs of 30C in the south-east.
But thunderstorms may hit the UK on Thursday
But it is not technically a heatwave in the eyes of the Met Office, as the high temperatures will not last long.
This sudden temperature rise is due to hot weather in Europe and high pressure in the UK.
Mr Wilson said the increase was down to "high pressure dragging in some of the warm air from the continent".