Forecasters said temperatures will drop -16C – making it the coldest night of the year.
The sub-zero conditions are set to last for the rest of the weekend, and the Met Office has issued a weather warning for ice to last until tomorrow.
WX Charts shows that Sunday, February 2 will get off to a chilly start in parts of Scotland and Northern Ireland
Temperatures will plummet to -16C tonight in parts of Scotland before rain arrives tomorrow.
But even in the south of England, forecasters warn that the mercury could fall all the way to -10C in central areas.
Met Office forecaster Simon Partridge said: "Exceptionally low temperatures of -16C in Scotland and -10C in England's South are possible on Sunday morning, with ice. Monday morning has -6C possible in Scotland and -3C in northern England.
"Snow showers are forecast on Sunday and Monday in Scotland, with rain in England as it turns milder and windier.
"Gusts are forecast to reach 40mph on Monday in the West and 50mph on Thursday in western Scotland.
"Most forecast models agree temperatures will dip again from around February 14 onwards, with potential for temperatures well below zero, further snow showers and a north to north-easterly flow, although there is uncertainty."
Tonight is set to be the coldest night of the year and Partidge added if temperatures drop to -15.8C then it will be the coldest night since 2010.
The Met Office has issued a weather warning ice that started at 4pm today and will last until 11am tomorrow as more snow is expected on Monday.
The warning is in place for the East of England, London and South East England and South West England.
Many are warned about icy roads, pavements and cycle paths where snow had melted in today's sunshine but will refreeze overnight.
There is an increased risk of accidents and injuries due to icy surfaces.
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