The mercury is set to plummet on Wednesday evening and on high ground in parts of Scotland there will be snowfall.
The Met Office said there will be bone chilling temperatures across the UK and some place will experience snowfall, which will be mainly restricted to parts of Scotland and high ground.
Parts of Scotland will see temperatures fall below zero in the early hours of Thursday which will spread to parts of northern England.
In Wales the mercury fall to between 2 and -4C on Thursday and many other parts of the country will see a range between 4 to -8C tomorrow morning.
Meteorologist Helen Roberts of the Met Office said parts of central and Southern Highlands will have the worst of it.
Roberts told The Sun, “Will there be snow from midnight tonight?
“Yes is the short answer, with some caveats.
“It won’t be continuous.
“There’ll be showers on and off, really over the very highest parts of the Cairngorms and possibly also part of central and southern Highlands.
“However, that will really be focused for the time being on just the highest peaks.”
Exacta Weather’s James Madden said, “We could start to see some significant snow events over higher ground.
“Looking to Bonfire Night and there will be a risk of widespread frosts as we get a taste of some early wintry conditions.
“We are about to see a change in the weather paving the way for cold and wintry end to autumn.”