Monday’s temperatures are expected to be up to 11C lower than during the sunshine of the Easter weekend as cold northern winds move over the country.
Parts of the UK are expected to see the mercury fall to as low as -7C (19.4F) overnight as forecasters warn the country faces a “bitterly cold” day.
It comes after the Met Office said highs of 17.9C (64.2F) were recorded in Pershore, Worcestershire, on Easter Sunday.
The town is expected to see temperatures of 7C (44.6F) on Monday, an 11C fall.
Met Office forecaster Simon Partridge said: “There’ll be a drop of 11 degrees between one day and the next, so you will definitely notice it!”
Mr Partridge explained that a change of wind direction would bring a change in the atmosphere, leading to chilly weather.
He said: “The air we had on Sunday came in from the south so it’s pretty mild having come off the continent.
“Overnight we’ll see a cold front moving southward across the country, it’s already across northern Scotland, and it’ll push its way southward overnight.
“That will introduce much, much colder air across the whole country.”
Sub-zero temperatures are expected in parts of northern England, while the mercury could drop to -7C in some areas of Scotland.
Snow warnings are in place for northern Scotland, with as much as 15cm falling in higher areas.
Met Office yellow warnings are in place until 10am on Tuesday for Scotland, with winds of up to 70mph forecast.
The east and west coasts of the country are likely to see a “wintry mix” of showers, which may include some hail.
Areas away from the coast are expected to be dry and bright, but with strong winds and below average temperatures, largely in the mid-single figures.
The wind will play a key factor in Monday’s weather, as while southern England may see highs of up to 7C, gusts up to 30mph may make the temperature feel closer to freezing.
Average temperatures for this time of year are around 10 to 12C but parts of the UK saw the mercury reach nearly 24C (75.2F) on Wednesday.