The Met Office is warning that temperatures could plunge all the way down to -5C in some areas – followed by 60mph storms, snow dumps and washouts.
The forecasters also issued weather warnings for 70mph gales tonight and tomorrow before the freeze arrives.
And although temperatures should rise again on Thursday next week, "disruptive snowfall" then threatens to cause travel chaos.
Met Office forecaster Marco Petagna said: “It turns colder on Sunday with air from Iceland, and it certainly looks cold until midweek in the East.
“Widespread frosts and the chance of freezing fog are expected, with Monday morning down to -5C in Scotland and -3C in northern England.
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But the jet stream will strengthen, bringing high rainfall totals into Thursday in the West.
Marco added: “Gales or severe gales with gusts up to 60mph in the West are expected into the weekend, with further heavy rain – and snow in the North, mainly on hills.”
Ex-BBC and Met Office forecaster John Hammond of weathertrending said: “Colder weather will arrive from the North, with East coasts prone to the odd wintry shower.
“There is a significant chance of disruptive snowfall as moister air arrives from the West from midweek.”
Yesterday parts of the country were submerged by flash floods as gale-force winds battered the country.
Dean Hall, a forecaster with the Met Office, told the Sun Online: "On Sunday it's staying unsettled with more showers and rain, particularly first thing which could be accompanied by strong winds across the south.
"We could see strong gusts of wind.
"Through the day the showers will move away southwards and we will see cold north-westerly flow across the UK.
"It will be a day of sunshine and showers but will certainly feel colder.
"It will be a cold night going into Monday. There will be a sharp frost in northern and eastern parts with temperatures of -5 or -6 overnight when there are clear skies."
This evening most areas will remain windy and showery, with severe gales affecting coasts across southwest England.
Frost and ice are expected to form in the North, as the weather calms but remains chilly.
Yesterday we told how Brits are braced for a blast of icy Scandinavian air next week, as the odds of a white Christmas is slashed.
As temperatures fall next week, bookies have slashed the odds on every city in Britain seeing snow on Christmas Day.
Aberdeen is the most likely to see a White Christmas at 6/5 while London’s chances have been cut from 5/1 to 9/2.
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