After flash floods and rain in the UK, the temperature is set to rise by 21 degrees Celsius in the “Indian summer” tomorrow.
Hurricane Sam would storm plumes of warm air from the continent pulled in by Sam’s remains.
Temperatures in some parts of the country could reach 21C on Thursday as high pressure builds up over Britain across Europe.
Much of Britain will be plunged into a blazing blast of sunshine and blue skies, although parts of the north-west will remain wet and windy.
British Weather Services meteorologist Jim Dale said: “Hot weather will start from the middle of the week, and we could see 21C in some parts of the country by Thursday.
“The high pressure building from the continent will lead to a change from wet, windy weather to dry, sunny conditions.
“As we are now in October, we can call this an Indian summer, and it is safe to say that we are in for some bad weather as a result from Hurricane Sam.”
North East Scotland and England will be warmer than southern Britain – with high temperatures of around 21C.
London and the South East could creep towards the 20C mark with above average temperatures forecast across the country.
Sam weakened from a Category 4 hurricane to a strong hurricane as it charged across the Atlantic over the weekend.
It will hit the jet stream as it approaches Europe and turns toward Iceland to help drive good weather.
Mr Dale said: “The remnants of Hurricane Sam will move towards Iceland as it moves across the Atlantic, which will mean it will miss the UK but will draw warm air from the south.
“It will also drive this area of high pressure across the UK, the combination of the two bringing better weather.
“It could last longer through the week or possibly mid-month when we expect to see a return to something more normal for the time of year.”
Precise weather forecaster James Madden said: “Some fairly mild weather will develop between storms.
“It could be a warmer than average month overall.”
The Northwest Territories can hold Sam’s stormy sting in the tail while the rest of the country bakes.
Parts of Scotland and Northern Ireland are battling the hatch for more wind and rain ahead of the weekend.
A Meteorological Department spokesman said: “Rain, heavy and at times incessant, will affect parts of Scotland and Northern Ireland.
“It will remain dry with variable clouds, sunny spells and patches of fog throughout the night.
It will be hot late. “
In fact, temperatures in the UK will be higher than in Monaco on the French Riviera, with peaks expected to peak at 19C or 20C this week.
It comes as London plunged into the chaos of travel in the city after an inch of rain, in just over an hour the streets of the city were completely flooded today.
The flash floods have wreaked havoc on several tube lines and flooded roads in the capital as drains clogged quickly due to rain.
Footage also shows heavy flooding on the A4 in London, and TfL has warned of greater danger on the A3, A41 and A12.
Buses and other cars can also be seen in the video struggling to pass through flood waters in Knightsbridge, while part of the M25 is also flooded.
According to the TfL website, both the Circle and District lines are partially suspended due to a signal failure due to flooding on Gloucester Road.
Transport for London is advising that tickets will be accepted on London buses.
The Metropolitan Line is also experiencing minor delays due to flooding near Aldgate.
London Overground is also suspended with no service between Willesden Junction and Clapham Junction due to flooding in the Imperial Wharf area.