The Met Office has said that temperatures are to plummet by 10C and could hit zero in parts of the UK this weekend.
Before then heavy rain is expected to hit for the rest of this week, with Wals and southern parts of England expected to see the heaviest downpours.
Snow is likely for parts of the Scottish mountains and the rest of the UK will turn much cooled by the weekend.
The first widespread frost will likely be seen across central and northern areas of the UK over the weekend.
Met Office Deputy Chief Meteorologist, Brent Walker, said, “As we head through second half of this week cold air will push southwards across the country and there is a risk that showers over mountains of Scotland could turn wintry.
“By the weekend we expect all regions of the UK to be in the cold airmass and overnight frosts are possible.
“With high pressure continuing to dominate our weather early next week, it will start largely fine, settled, and cool by day, with cold nights and a risk of rural air frosts in places.
“Any early morning mist or fog should clear quickly and there could be a few showers possible around some coasts at times.”