Patchy rain will move southwards across northern England and northern Wales, becoming more persistent later.
It will be mostly dry and bright elsewhere after a chilly start, but further rain will spread into the far north and west later.
Maximum temperature 21 Celsius.
Following a chilly start to the day for some, it will be a dry and bright day for much of the UK.
There'll be plenty of sunshine across England and Wales this morning before some fair weather cloud builds this afternoon.
Scotland and Northern Ireland will see the cloud thicken through the day with some patchy rain in the far west later.
Clear skies across much of the British Isles tonight will mean below-average temperatures in many areas, with the mercury falling to as low as nine degrees.
Monday will be fine with sunny spells even across Scotland, with temperatures reaching 22 degrees in the south of England.
A fine Sunday is on the cards for most of England, Northern Ireland and Wales with highs of up to 23C in the south.
However, it is a different picture in Scotland where showers are breaking towards the north and east of the country.
ITV News Weather Presenter Alex Beresford has the latest forecast:
Heavy, blustery showers are going to affect northeastern parts of Scotland this morning, but will become confined to the far northeast this afternoon.
The rest of Scotland is set to be rather cloudy with some bright spells.
Other parts of the UK should see a good amount of sunshine once the cloud in the south clears.
Most places will stay dry, although the odd showery outbreak cannot be ruled out, most likely over Northern Ireland and perhaps East Anglia.
By ITV Weather Presenter Alex Beresford
A cold front will sink south eastwards bringing cloudier skies and also some outbreaks of rain on Saturday, particularly over the central swathe of Britain.
Overnight we are looking at lows of 8C or 9C across the north, although slightly warmer in the south with temperatures hitting 12C or 13C.
The rain across central areas will become more showery as it edges southeastwards.
Most of the South should stay dry with warm with sunny spells developing, although it is likely to stay rather cloudy in the east.
It will be cooler in the north with sunny spells and some scattered showers for Scotland.
A similar set up to the last few days - cloud will come and go with spells of sunshine in between.
Rain across parts of mainland Scotland will shuffle slowly southwards but wont make too much headway.
Highs of 22C in the sunshine - but cooler behind the rain.
After a slow start in places tomorrow with cloudy skies first thing it will brighten up and another dry day with spells of sunshine is expected.
Not wall to wall blue skies but warm for the time if year with highs of 25C possible in places - not bad for early September and a big improvement on much of August.