Britain will be split down the middle today with heavy rain across many parts of the North while the South enjoys mild, sunny weather.
But temperatures are set to plummet later in the week, with the Met Office forecasting “rather cold” conditions from Thursday to Sunday.
The mercury will drop to just 2C in northern England and reach freezing in Scotland.
And even in London, temperatures will drop to a chilly 4C later in the week.
It comes as forecasters predict a colder-than-average December due to “Arctic influxes” which could bring temperatures as low as -5C.
The colder weather will start to bite in Scotland later tonight, while England, aside from some windy conditions, will be relatively mild.
The South East in particular will be overcast but dry, and fairly warm for the time of year.
By Tuesday night, rain will have dropped down into Wales and other parts of northern England.
Temperatures in the North will be colder from Wednesday while heavy showers move southwards.
And by the end of the week, the Met Office expects the weather to feel “rather cold” generally, with some foggy spells, particularly at night.
Rain, heavy in places, continues across many northwestern areas although somewhat brighter in the far northwest. Elsewhere largely dry with some brighter interludes although a little drizzle on some western hills. Mild away from the far northwest. Windy in places.
Southeastern areas mild and rather cloudy but largely dry. Rain in the northwest UK sinking into Wales, northern and western England. Clearer, colder weather following, scattered showers in western Scotland.
Rain, perhaps heavy in places, edging east across southern and eastern England. Elsewhere much brighter but colder, with scattered showers mainly in the northwest and far north, where occasionally heavy.
Outlook for Thursday to Saturday
Fog and low cloud forming each night and locally persisting by day, otherwise largely clear or bright. In the northwest it will be cloudier with some light rain. Rather cold.