Pockets of the UK are expected to wake to a white Christmas, with a smattering of snow due.
Forecasters have issued a cold weather warning for the festive period, with temperatures expected to drop.
On Boxing Day in particular, the Met Office said snow and ice would probably disrupt some road networks and travel routes.
It said some short-term loss of power was also possible.
Motorists driving to see family and friends in South Wales and south-west England have been warned to take care on the roads as heavy downpours could hit both regions.
Temperatures are expected to plunge as low as minus 2C in parts of the north and east of England between Christmas Day and December 28, prompting a cold weather warning from the Met Office.
But the weather across most of the UK will be slightly warmer than average for this time of year, forecaster Simon Partridge said.
Southern England is expected to see mild temperatures of between 7C-9C, with spells of rain and cloud.
Mr Partridge said: “On the high ground, we’re quite likely to see a white Christmas, on Christmas Day and Boxing Day.
“It’s quite limited snow, but we’ll probably see some snow on both days.”
Mr Partridge said colder, brighter spells were expected for Scotland.
However, low cloud and fog will roll in across the Midlands and up towards the Scottish border, also taking in Northern Ireland.