Brits have been warned of ice, heavy rain and potential flooding in the hours ahead as the post-Christmas weather slump continues.
The Met Office has issued a yellow rain warning for parts of south-west England and South Wales from 2am until 3pm on Wednesday, while a yellow ice warning remains in place in northern Scotland until 10am Wednesday.
Commuters heading back to work have been warned that rain may make journey times longer due to spray and flooding on roads , while some bus and train services could also be affected.
The Environment Agency in England and Natural Resources Wales have meanwhile advised h omeowners and businesses that flooding is possible on Wednesday, potentially causing disruption to power supplies and other services.
Met Office meteorologist Rachel Ayers said: "We have a yellow rain warning in force from 2am tomorrow until 3pm. And that covers across Dartmoor and into the southern parts of Wales as well.
"We're looking at the potential of being 40-60 millimetres of rainfall in nine to 12 hours before the rain clears away in the afternoon."
Snow will also fall across northern parts of Scotland in the early hours of Wednesday morning, while a dry start is expected elsewhere, with rain developing in the south later on.
Rain will arrive in Scotland later on Wednesday, and coastal gales are likely in the south of England
Later on Wednesday, there will be rain in Scotland, with the heaviest over hills in the South West. The South of England will also see coastal gales.
Unsettled weather is expected to continue throughout the week before clearing to showers on New Year's Eve.
UK weather:
Windy with rain moving north-east followed by blustery showers.
Today:
Rain across southern areas will move north-east across all areas through the day, possibly with some hill snow in the far north later. Scattered showers and sunny intervals following into the southwest. Becoming windy, particularly in the south, where mild.
Tonight:
Rain and hill snow in the far north clearing, then windy with blustery showers, some heavy, and frequent in the northwest.
Thursday:
Colder and windy with sunshine and showers, some heavy in the north and west with a risk of hail and thunder. Best of dry weather in the east.
Outlook for Friday to Sunday:
Unsettled with spells of rain, occasionally heavy, pushing across most areas Friday and Saturday. Some snow likely in the north. Further rain in the south Sunday. Colder with showers elsewhere.
