There could be up to four inches of snow in northern parts of the country on Sunday, and strong gusts are expected to create blizzard conditions.
A yellow 'be aware' warning is in place for the north of England and throughout Scotland, with the alert area widening tomorrow and Tuesday to cover Northern Ireland and the East Midlands.
A band of wintry showers will sweep in from the east this morning which could bring heavy snow to high level routes and some accumulations at lower levels in some Scottish areas.
The showers are expected to move away later in the day.
Overnight rural parts of northern England experienced freezing temperatures, while in the Highlands the mercury fell to a chilly minus 7C (19F).
Meteorologist Mark Wilson said: "It's set to be a very wet and windy day for most parts. Across northern parts temperatures will reach a maximum of around 5C (40F), while the south-west will briefly hit 10C (50F)."
Icy conditions are forecast tomorrow and Tuesday, as slow melts away leaving a risk of slippery patches on untreated surfaces.
Meanwhile there are currently more than 50 flood alerts out across England and Wales, with the majority in the south of the country.
Strong winds and higher tides than average have prompted a warning over a flooding risk brought on by large waves in coastal areas.
People walking on coastal paths and promenades are urged to take care, the Environment Agency said.