Brits will plunge into warmer temperatures than Barcelona from Wednesday as the mercury rises to 21C as high pressure is on the way.
It follows a battle through two days of rain before seeing temperatures 21C and a week-long “Indian summer”.
The Met Office currently has a yellow weather warning for rain for this evening and thunderstorms are expected in the far southwest.
According to the Met Office, there was another warning for wet weather on Tuesday with the “rain arc” moving north.
West Cornwall has received 30 mm of rain since the beginning of October.
Wind and rain, however, will give way to sunny and blue skies on Wednesday as temperatures begin to rise.
And the mercury is projected to reach 21C by Thursday, which will bring us a week-long “Indian summer” – and this week will be warmer than Barcelona with rain 20C.
Balmy’s position will be driven by the remnants of Hurricane Sam which is heading across the Atlantic to Britain.
Forecasters say it is expected to move towards Iceland, exerting high pressure on the UK.
British Weather Services meteorologist Jim Dale said: “Sam’s remnants are going to change from wind and rain to very nice sunny weather.
“The pre-storm will move toward Iceland and allow high pressure to build up across Europe and the UK as bale wind blows from the south.
The temperature will be highest around Wednesday or Thursday.
“It can feel very hot in the glow, and it’s safe to say we could be in for an Indian summer.
“This magic should last a few days, but the pattern may continue for a long time, possibly mid-month.”
Scotland and parts of north-east England will be warmer than southern Britain with temperatures around 21C.
London and the Southeast could creep towards the 20C mark with above-average temperatures forecast across the country.
Pre-Hurricane Sam will hit the jet stream as it heads toward Europe to help drive fine weather.
Britons, however, must grit their teeth by the middle of the week for another blast of autumn.
‘Jekyll and Hyde Seasons’
Mr Dale said: “Low pressure will remain until the beginning of the week and there will be even more wind and rain paths.
“Sam comes along on Wednesday and will move closer to the jet stream before heading for Iceland, allowing high pressure to build up from the continent.
“This will lead to a change in weather with high temperatures of 21C in parts of north-east Scotland and northern England, while in other places, it could reach 18C or 19C.
“This Jekyll and Hyde season is typical for October.”
A Met Office spokesman said: “There will be rain, sometimes heavy rain, with a coastal thunderstorm affecting England and Wales on Tuesday, with isolated showers drying up elsewhere.
“It will get warmer and more distant from the far northwest from Wednesday.”
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