A yellow weather warning has been issued by the Met Office, as “dense fog” is due to hit parts of Wales overnight.
The adverse weather is due between 5pm on Sunday, November 29 and 8am on Monday, November 30.
Due to the dense fog patches the Met Office warns that people should expect slower journey times on the roads, while bus and train services could see delays.
They also warn that flights could be delayed or cancelled.
According to the Met Office, most of south Wales will be affected by fog, coming in from the eastern border at Monmouthshire and reaching as far west as Milford Haven.
It’ll also cover most of the south west of England, reaching Oxford to the east.
On Twitter, the Met Office has said: “The latest satellite picture shows that there’s a lot of low cloud around this afternoon, giving some fog patches in places.
“The best of the sunshine is developing across eastern Scotland, southwest Wales and Devon and Cornwall.”
In another tweet, they added: “Low cloud will affect many areas this evening, giving some hill fog, and some dense fog patches will also form under the clearer skies across southwestern parts of the UK.”