Parts of England are shrouded in fog this morning as Brits wake up to the first sign of the chilly months.
The fog is expected to hang around the south-east until about 10am before it is burnt off by the sun.
It’s being caused by moist air trapped underneath a high pressure system, the Met Office said.
“That causes condensed clouds at the surface,” meteorologist John Griffiths said.
Parts of England are expected to hit a high of 25C after the fog clears but the weather will be much more unsettled from Wednesday.
The Met Office is forecasting freezing temperatures in rural areas across Northern Ireland, Scotland and north-west England.
Those areas may experience frost for the first time in months, Mr Griffiths said.
In other parts of the country it will be “much colder” than the recent hot days.
On Thursday, forecasters are predicting the odd rumble of thunder with long spells of rain across England.
Fog has burned off, the sun has arrived and so has the harvesting crew for the Maize crop in the neighbouring farm. A busy few hours getting that all gathered in for Animal feed. We get our view back to the NE, currently occupied by tall Maize. pic.twitter.com/LjhpO86UQe
— Dan Ludlow (@dancludlow) September 21, 2020
The blustery conditions are likely to continue through to the weekend with the heaviest rain predicted to fall in the north.
Temperatures are expected to reach highs of between 15C and 18C in the south and cooler in the north.
Mr Griffiths said this week represented a marked shift in the weather away from the hot and sunny days of late.
“It’s certainly starting to become more autumnal this week,” he said.
“It’s a big change in the weather.”