As well as feeling cold, there is an increasing threat of sleet and snow showers feeding down across the country.
THURSDAY: Mostly sunny and cool.
Tuesday: Cloudy with cold front by middle of the day.
The cold snap will hit the north-west of the country by the middle of the week, sweeping across the United Kingdom and reaching the south-east by Thursday, say the Met Office. Freezing temperatures are possible overnight Monday and into Tuesday morning.
Monday will kick off the workweek under sunny skies with a high of 51 and a low of 40.
"A much colder air mass will then take charge from Thursday morning".
Tomorrow will continue with cloudy conditions with a new bright or sunny spells forecast. The low that night is expected to be 23.
The inflow of arctic air is expected to bring plenty of sunny spells, but the temperature will be far lower than the milder weather the United Kingdom is now experiencing.
Forecasters are predicting that the United Kingdom will be hit by a cold snap later this week, bringing the prospect of hail and snow for some parts of the country.
The current long-range forecast predicts that temperatures are likely to remain below average for the time of year for most of December with the threat of wintry showers never too far away.
After a milder weekend, Suffolk and Essex are set for lower temperatures through the week with the chance of more wintery showers and ice on Friday and into the weekend.
Saturday, it will be sunny with a high near 39, the weather service said.