August Bank Holiday 2026: M25 and Euston Travel Forecast

By AtheneNet Travel Desk
Published 24 August 2026

Drivers and rail passengers should prepare for slower journeys over the August Bank Holiday weekend, particularly on Friday afternoon and Monday evening. Existing M25 lane restrictions may remain despite a pause in major roadworks, while planned engineering work could affect journeys through London Euston. Route-specific checks will be essential before departure.

• Friday afternoon is likely to bring the first major getaway traffic.
• Monday evening is expected to be the busiest return window.
• Existing M25 restrictions may continue through the roadworks pause.
• London Euston passengers should confirm their complete journey before travelling.

When roads and trains are likely to be busiest

The bank holiday runs from Saturday 29 August to Monday 31 August, but disruption may begin with the Friday getaway. These are planning forecasts rather than guarantees: collisions, weather and short-notice operational changes can move congestion from one period to another.

Rail demand can also concentrate around the start and end of the weekend. Engineering work may lengthen journeys even when a passenger’s usual train is still shown, particularly if a change of station, replacement bus or reduced service is required.

How to reduce the risk of an M25 delay

National Highways said on 20 August that major roadworks were scheduled to pause for the bank holiday. That does not mean every lane will reopen: pre-existing M25 lane closures are expected to remain in effect.

Drivers should check the exact junctions used by their journey rather than treating the M25 as a single route. A restriction on the opposite side of London may have no direct effect, while a short closure near an interchange can delay several connecting motorways.

Useful options include:

• Compare clockwise and anticlockwise routes shortly before leaving.
• Use the A406 or A205 only when live traffic information shows a genuine time saving.
• Consider whether an orbital motorway journey can be avoided entirely by changing the departure point or destination station.
• Follow signed diversions during closures instead of navigation-app shortcuts through residential roads.
• Add a break and contingency time to airport, ferry or ticketed-event journeys.

Leaving before Friday’s afternoon surge or before Monday’s return traffic builds is likely to be more effective than trying to recover time once queues have formed. Drivers should also check fuel or charging range before joining a congested section.

London Euston passengers need a route-specific rail check

Planned engineering work is expected to affect some journeys using London Euston during the weekend. The practical impact may differ by origin, destination and operator, so a general station warning cannot show whether an individual train will run normally.

Use the National Rail journey planner with the intended date and departure time. Check both outward and return journeys, including every connection. If the result shows a changed London terminal or replacement transport, allow additional time to move between stations or reach the bus departure point.

Build in time for connections

Passengers should avoid relying on the final practical connection of the day. Reservations, bicycle spaces and assisted-travel arrangements may also need to be reconfirmed if the itinerary changes.

Before leaving, save the latest itinerary and check the departure board again. A train that still operates may depart earlier, take longer or require an additional change because of engineering work elsewhere on the route.

A 15-minute check before starting the journey

1. Enter the complete road or rail journey, including the return leg.
2. Check National Highways for restrictions around every M25 junction being used.
3. Check National Rail for engineering changes, replacement transport and altered London terminals.
4. Compare departure times outside Friday afternoon and Monday evening.
5. Save one realistic alternative, but retain the official diversion or rail itinerary as the default.

The most useful final checks will be the National Highways traffic information for the relevant junctions and the live National Rail journey result. Review both on the morning of travel and immediately before departure, because incidents and operating changes can alter the forecast.

Source: National Highways