Thick fog triggers Sunday night travel warning for London

Thick fog forecast to settle over London on Sunday night has prompted a yellow weather warning and raised the prospect of significant disruption for road, rail and air travellers into Monday morning.

Yellow fog warning stretches across London and southern England

Publicly available information from the Met Office shows a yellow warning for fog in force from 18:00 on Sunday 8 November until 11:00 on Monday 9 November, covering London and South East England along with large parts of the Midlands, South West England, Wales and other regions. The alert highlights a risk of difficult travel conditions as visibility drops, especially during the late evening and overnight period.

The London and South East area is included in a broader warning zone that also takes in sections of the East Midlands, East of England, North West England and West Midlands. Local coverage from towns such as Milton Keynes confirms the same warning window, underlining how widespread the fog is expected to be across the commuter belt into the capital.

Guidance within the national alert indicates that dense fog patches could bring visibility down to around 50 metres or less in some places, with the worst conditions anticipated during the second half of the night. The fog is expected to thin only slowly during Monday morning, particularly in more sheltered inland areas.

Road users advised to expect slower journeys and poor visibility

The yellow warning notes that motorists should be prepared for slower journey times on key routes into and around London, including orbital and radial motorways and major A-roads. Where fog thickens, drivers are urged through official travel advice to allow extra time, reduce speed and ensure fog lights are working before setting out.

Met Office safety information linked to the warning recommends that drivers check live road conditions and be ready to amend travel plans if visibility deteriorates. In past fog events of a similar scale, stretches of the M25, M4, M3 and A40 corridors have been particularly prone to sudden drops in visibility during the small hours and early commute period.

Localised freezing patches are not expected to be a primary hazard this time, with forecast overnight temperatures around or just above freezing across much of London and the South East. However, the combination of moisture and low light can still make road markings harder to see and increase stopping distances, especially on rural approaches to the city.

Rail and air passengers warned of possible delays and cancellations

The current Met Office guidance for this fog episode flags a chance of delays to bus and train services as operators adjust timetables or apply speed restrictions where visibility becomes severely restricted. Early-morning commuter services into central London are likely to be the most vulnerable to knock-on disruption if dense fog lingers through the rush hour.

Air travel is also highlighted as at risk, with the warning explicitly mentioning the possibility of delays or cancellations to flights. London’s main airports, including Heathrow, Gatwick and London City, rely on low-visibility procedures when runway and taxiway conditions deteriorate. Recent coverage of yellow fog warnings has shown that even when runways remain open, aircraft movements can be slowed, leading to stacking in the air and longer turnaround times on the ground.

Travellers planning Sunday night or Monday morning departures are being advised, in publicly available guidance from airlines and airports during similar events, to monitor flight status closely and allow additional time to reach terminals in case of heavier traffic or reduced public transport frequencies overnight.

Overnight pattern: fog redeveloping after a murky day

The Met Office London forecast for Sunday points to a chilly, murky start with mist and fog slow to clear through the morning, followed by some brighter spells and light winds in the afternoon. Maximum daytime temperatures are expected to reach around 12 degrees Celsius before dropping back towards 0 to 3 degrees overnight, conditions that are conducive to renewed fog formation once skies clear.

Further detail linked to the warning states that fog patches are expected to “form readily again during Sunday evening and overnight, becoming extensive by Monday morning.” Where the fog turns dense, visibility could fall well below 100 metres, making navigation challenging on unlit roads and exposed sections of motorway.

Forecast discussion material suggests that the fog may prove stubborn in some low-lying and inland parts of the warning area, thinning only slowly during late morning on Monday. Coastal locations and higher ground may see quicker improvement as light breezes begin to develop.

What visiting travellers should do now

For visitors using London as a base, the key message from publicly available travel and weather advice is to build flexibility into evening and early-morning plans. Those arriving or departing by air on Sunday night or Monday morning are encouraged to check in online where possible, monitor airline updates and be prepared for longer-than-usual transfer times between central London and the airports.

Rail passengers heading into major London termini such as London Paddington, Waterloo, King’s Cross and Euston may wish to allow extra time to reach stations and to consider earlier services if connections are tight. Regional reports around the warning area indicate that some local operators are already highlighting the possibility of reduced speeds and minor timetable changes if fog proves persistent.

For road trips, both within London and across the wider South East, travellers are advised in official safety leaflets to avoid unnecessary overnight driving in dense fog, use low-beam headlights rather than full beam, and keep larger gaps between vehicles. Anyone with the option to shift journeys to the middle of the day on Monday, when fog is more likely to lift, may find conditions significantly easier.