Huge swathes of the country was forecast cold temperatures for the remaining day of the weekend.
Scotland is expected to bear the brunt of the Arctic blast, with Aberdeen and Dundee forecast to hit -1C on Sunday morning.
While the official temperature was forecast at -1C, however, strong polar winds are likely to make it feel more like -4C in some regions.
The Met Office issued a relatively rare yellow warning for ice, as a result of the forecasted chill.
The warning was in place from midnight on Sunday morning up until 8am, and covers about half of Scotland.
It warned the public that there's "likely" to be icy patches in regions north of Edinburgh - and there's even a risk of injury from slips and falls.
The rest of the UK is also in for a rather chilly Sunday, with a low of 3C and a high of 8C.
Similar to Scotland, however, it will likely feel a lot colder than that.
The Midlands, Yorkshire, and Lancashire were forecast perceived temperatures of 0C on Sunday morning.
Further south, it's expected to feel like it's about 3C, so coats and jumpers would still be advisable.
The Met Office also warned of possible rain in northern parts of the UK.
"Watch out for some icy stretches in parts of Scotland first thing Sunday morning," it tweeted on Saturday evening.
"Otherwise many of us starting the day mild with some sunshine across Wales and England.
"Rain however will be spreading in across Scotland, with perhaps the odd spot lingering in eastern England."
UK five-day weather forecast
This evening and tonight:
Rain and hill snow over Scotland and northeast England clearing, with a frost in places in the north. Mostly dry with clear intervals in south. Rain in northwest later.
Sunday:
Dry and very mild with sunny spells across central and southern areas. Cloudier in the north with rain for far north and northwest, where becoming windy with gales in places.
Outlook for Monday to Wednesday:
Mild Monday and Tuesday with outbreaks of rain and drizzle in the north spreading southeast later. Turning colder Wednesday with blustery, wintery showers.
