Britons can revel in two days of heat this week brought in from a blast from the tropical Azores.
Mercury is set to reach into the mid-twenties in parts of the country today and tomorrow.
This comes as clear skies and sunshine is brought in from high pressures across the Atlantic from the Azores Islands off the coast of Portugal.
However, the Met Office warns of rain moving northeastwards with some heavy bursts in the northwest.
Elsewhere, widespread low cloud with drizzle on western hills have also been forecasted.
Thermometers will leap from today with the best of the sunshine set to bathe southern regions, reports Mirror Online.
Met Office spokesman Oli Claydon said: "It will feel nice in the sunshine during the bright spells, and we could see temperatures of 24C (75.2F) in southern Britain on Tuesday and around 23C (73.4F) on Wednesday.
"The calm and mild conditions are due to an Azores high blocking unsettled conditions from moving across the country.
"This Azores high will exert its influence largely over southern Britain into the weekend."
It will feel cooler in Scotland and parts of northern England although the mercury will lift into high double figures, he said.
A cold front will bring a chillier feel to the whole country after mid-week when southern temperatures may struggle to rise above 20C (68F), he added.
A spokesman for The Weather Company said: "Tuesday will see sunshine across central and southern parts and to the east of the Pennines lifting temperatures into the low 20Cs and as high as 24C (75.2F) for East Anglia and the southeast, around 3C to 5C above normal
Jim Dale, meteorologist for British Weather Services, said: "There is a fairly reasonable chance of an Indian Summer bringing a couple of weeks of better weather at the end of September and into October.
UK weather: Lucky Brits set to bask in one last blast of summer heat next week
"Sea temperatures around the UK are above average and this could help to drive warmer conditions later this month."
Britain's weather will, however, turn more seasonal towards the end of this week with cooler temperatures and the chance of rain.
The UK still has some fairly typical autumnal weather to get through today, with the Met Office forecasting some mild and mostly cloudy weather with outbreaks of mainly light rain and drizzle over some western coasts and hills.
But it will be mostly dry with clear spells across Scotland and parts of Northern Ireland, ahead of the potential mini-heatwave in coming days.
Bookmaker Coral has September at evens to be the hottest September on record in the UK.
Spokesperson John Hill said: "Summer is going to return next week and with one last heatwave, our betting suggests this month could end as the hottest September on record."
Parts of Northern Scotland have been placed on drought alert.
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