Despite the official end to summer last month, balmy weather is expected in the coming days in Britain.
Mercury levels are expected to hover around the mid-20s for large parts of the UK, while some areas are set to bask in highs of 29C.
It will still be 'touch and go' whether some locations will tip into official heatwaves though, the Met Office has said.
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So how hot will it get? And when will the heatwave last until?
Here is the Met Office forecast for the UK this week:
Met Office forecasted temperatures
Temperatures are predicted to reach highs of 28C in London on Monday and rise to 29C on Tuesday.
Northern areas are also expected to see an increase, with Greater Manchester seeing highs of 24C on Monday and 27C on Tuesday.
Both Northern Ireland and Scotland are set to share the pleasant conditions, with highs of 23C and 22C predicted in Belfast and Aberdeen respectively on Monday.
Met Office spokesman Stephen Dixon said: “Temperatures (on Monday) are going to be widely in the mid-20s, especially in the south, where there’s going to be spells of good sunshine.
“Heading into Tuesday, that warmth spreads further north across the country, bringing a fine and dry day for most with that warm weather extending across the UK.”
How long will the warm weather last and will there be a heatwave?
The Met Office said the warm spell is expected to last until Wednesday.
Predictions show some areas are on the “borderline” of experiencing an official heatwave - when a location records a period of at least three consecutive days with daily maximum temperature levels, which vary across the country.
These include 25C for central England and Wales – where it has been forecast the threshold could be exceeded – and 28C for London and the South East.
Mr Dixon said: “It’s not uncommon for the UK to get warm spells heading into early September.
“There’s a chance of some areas reaching heatwave criteria, but that is fairly borderline and the breakdown that is happening on Wednesday will subdue the temperatures as well.
“So it will be touch and go for some places whether a heatwave is officially in the forecast.”
Although good conditions will last until Wednesday, “rain and instability” will follow, Mr Dixon said, leading to possible thunderstorms in south-west England.
