Temperatures are expected to drop to -8C over snow cover in northern Scotland, inching upwards to a maximum of 2C overnight in the south of England.
“It’s not the coldest night of winter so far – that took place in December with a low of -10.3C – but it’s still cold and there will be a wintry mix of sleet and snow in the west with elements of thunder,” said Met Office spokesperson Oli Claydon.
“It’s also worth keeping an eye on weather warnings as we will be issuing more as the day goes on, particularly for ice,” he added.
Weather warnings for ice are already in place for large parts of northern England, Scotland and Northern Ireland, and may be extended into the early hours of Tuesday morning.
Residents in these areas should be aware of potential travel disruption as icy patches may form on untreated roads, pavements and cycle paths.
“We’re seeing a warming trend as we head later into the week, so things will get much milder from Wednesday onwards,” said Mr Claydon.
Daytime temperatures are expected to hit double digits, between 10C to 13C in London on Wednesday and Thursday.
The milder days will be accompanied by wind and rain in most parts of the UK later this week, but the Met Office added: “As we head through the first full week of February it currently looks most likely that we will see a gradual trend towards more settled conditions, particularly in the south, and there is a chance that these will extend across the whole country at times.”