The Met Office has issued a yellow warning of dense fog patches for Swindon and the South West.
Motorists are warned to expect some travel disruption and slower journey times until around 8am tomorrow morning.
A spokesman for the Met Office said: “Fog over parts of the south-west Midlands and West Country will thicken up during Sunday evening, whilst some dense fog patches are also expected to form early evening across south-west England and South Wales.
“The visibility will reduce to 50-100 m in places. Fog should start to thin on lower ground by the end of the night.”
Public transport users are also warned that delays to bus and train services are possible.
