Torrential rain, thunderstorms and strong winds are set to hit the UK next week, bringing an end to the September sunshine.
Forecasters have warned that a 'big change' is on its way and the warm spell enjoyed by the nation in recent weeks will come to an abrupt end as a cold front sweeps in from the North Atlantic.
The cold front, which is set to push eastwards tomorrow evening, will see heavy rain across Scotland and western parts of England and Wales, with highs of 61-66F (16-19C) expected on Monday.
A seven-day downpour with 'cyclonic' conditions could also develop from Tuesday and last into October, bringing largely unsettled conditions across the UK.
It comes after the nation enjoyed a blast of the Indian summer this week, with temperatures almost 10F higher than the average for this time of year.
Met Office meteorologist Meteorologist, Adam Thornhill, said: 'A shift in the position of the jet stream will bring a change in our weather next week.
The nation will be hit by torrential rain, thunderstorms and strong winds as a cold front sweeps in from the North Atlantic. Pictured: Commuters hold their umbrellas as they walk across London Bridge in the rain
The sun begins to rise through the mist near Denton Wharf in Kent this morning as the UK braces itself for a cold front to sweep across the North Atlantic
'A cold front associated with a low-pressure system in the North Atlantic will spread eastwards bringing wet and windy conditions across the whole country throughout Monday.
'Behind the cold front, conditions will feel much more autumnal with a cooler feel and blustery showers for many'.
Jim Dale, meteorologist for British Weather Services, said: 'We are about to see a big change, and after the milder weather we have seen through September, autumn is about to break down the door.
'Low pressure from the Atlantic will move in next week with plummeting overnight temperatures next week bringing a small chance of frost to the highlands of Scotland.
'We are watching out for fireworks in October which threatens a particularly active season of storms and ex-hurricanes coming in from the Atlantic.'
Mr Dale added: 'I would expect a pattern of stormier weather to start revving up in October.
'The jet stream is about to move south and this will bring more of an influence form the northern Atlantic.
'Summer ended with a soft landing thanks to an extended mild weather in September, but October threatens a very different scenario.
Clouds begin to form near Denton Wharf in Kent today as forecasters warn that a 'big change' is on its way
Heavy rain will sweep across Scotland and western parts of England and Wales as mercury levels begins to drop
Heavy and persistent rain is expected in Scotland which may lead to some disruption on Monday morning, according to the Met Office
'This is something to keep our eyes on and it is a case of watch this space.'
James Madden, forecaster for Exacta Weather, said: 'We are likely to see some extremely stormy weather at times as former hurricanes turn into large low-pressure systems as they head in.
'October looks like a very unsettled and wet month overall on current indications and Autumn looks set to arrive on cue.
'We could see two to three major stormy periods and excessive winds developing within this period.'
Rain is predicted across the northwest of Scotland on Monday is expected to sink into Northern Ireland and southern Scotland by tomorrow evening.
As the weekend approaches, periods of heavy rain are expected in northwestern areas, with gale force winds in the far north at times.
Elsewhere, it will be mostly 'dry, bright and feeling warm but breezy with some showers', according to the Met Office.