Temperatures will fall from a peak of 73F (23C) on Thursday to a low of -9C by mid-week, a difference of 32C. Pleasant 59F daytime temperatures yesterday will drop to a chilly average of 45F by Wednesday lunchtime.
Experts said the topsy-turvy climate was caused by a shift in wind patterns. Warm continental air will be replaced by bitter Arctic winds from the North Pole.
After the third hottest March since records began 350 years ago – 47F was the average for the month – the plunge in temperatures will come as a shock....Click Daily Express Link for more
#Clouds ready to return ... just in time for the weekend, with snow forecast over Easter
#Chances of snow in the Scottish Highlands by Tuesday
#Braemar in the Cairngorms expected to see lowest temperature as mercury drops to -11C
After days of glorious sunshine, Britain is set to be hit by a wave of wintry weather - with temperatures halving across much of the UK and even dropping to as low as -11C in some parts.
Forecasters predict that this weekend will be less settled than recent days, with rain likely to affect most areas and temperatures dropping to 13C in London.
Met Office spokesman Charles Powell said: 'By Saturday the temperatures will be down to 12C and 13C. We will still get some bright weather but we will lose the wall-to-wall sunshine we have enjoyed.
Downpours are likely in the north and snow is expected over the Scottish Highlands with up to six inches of snow possible on high ground. The wintry weather will then spread south during the week.
And temperatures are likely to plummet to an average of 45F by Wednesday - in stark contrast to this week's high of 73F.
Weather experts say the dip in temperatures is caused by a change in wind patterns, with Arctic blasts replacing warm continental breezes.
Freezing overnight temperatures could lead to icy roads, but with roads still warmed from the recent high temperatures the snow is unlikely to settle.
MET Office spokesman Helen Chivers said current forecasts indicated there was a slim possibility that the Shetland Islands may see some snowfall on Sunday with chances of snow in the Scottish Highlands by Tuesday.
She said: 'Cold air in the Norwegian Sea at the moment is likely to catch up with a frontal system, turning the back edge of rain over Scotland into snow.
'It will start in the high ground over 400 metres but as it moves south there will be a small risk of snow or sleet at lower levels.'
Braemar in the Cairngorms is expected to see the lowest temperature with the mercury plunging to hit -11C by Wednesday according to independent forecaster Netweather
Netweather is also predicting large parts of northern England, the whole of Scotland and Wales to experience below freezing conditions while the rest of the country could see widespread ground frost....Click Daily Mail for more