A CHILLY start to the weekend has given way to glorious sunshine – but Brits are warned of heavy rain and flooding soon after.
The Met Office recorded certain parts of the UK plummeted to 4C last night, but a brighter outlook is on the horizon.
Temperatures remained cool this morning across Britain, and stay mild for the rest of the day hovering around 15C.
However, those in the south east will see highs of a warmer 19C.
The majority of the UK is forecast to enjoy a clear and bright autumn day with sunny spells into the evening.
The crisp weather comes as we head into the autumn equinox taking place in the northern hemisphere, officially signalling the end of summer.
Senior Operational Meteorologist, Greg Dewhurst, told The Sun Online what can be expected today: “A ridge of high pressure will bring a fine and dry day across much of the UK, with some bright or sunny spells.
“Winds will remain light and temperatures will reach 19C.
“Into the evening and overnight cloud and rain will move in from the west. Temperatures staying in double figures for all.”
However, tomorrow the mercury is forecast to reach highs of 21C in London and surrounding areas in the south by late afternoon.
Moving north, temperatures gradually fall with Scotland expected to see figures stop at 15C.
The Met Office forecaster added: “A cloudier start to the day, with outbreaks of rain moving north and east through the day.
“The rain turning heavy at times, particularly across parts of Northern Ireland, Scotland and northern England.
“The wind increasing for all, with gales in the north and west. Some drier and brighter skies developing across central and southern parts of the UK through the afternoon.”
Meteorologist Alex Deakin continued: “We’ve jumped up by several degrees in most locations by Sunday.
“That’s a tropical system that’s driving the wet and windy weather in – so inherently the air is warmer, so temperatures will be higher.”
However, this tropical weather system has also triggered a yellow weather warning for some tomorrow.
A yellow weather warning is in place for rain from 1pm until just before midnight.
The notice covers parts of western Scotland including the outskirts of Glasgow.
Met Office meteorologists have urged those affected to stay safe amid chances of flooding.
“Floodwater, particularly in fast flowing areas, will pose a very small danger to life,” it reads on their website.
“There is a small chance that homes and businesses could be flooded, causing damage to some buildings.”
Access to some areas could also be cut off due to flooded roads.
Journey times are expected to be disrupted with rail services delayed or cancelled.
Wet and wild conditions could also lead to travel chaos on the roads.
This weather pattern is expected to continue into the first half of next week.
But, temperatures will remain above average for this time of year for much of the UK, according to the Met Office.