2026 operating status

Know what is final.

Confirmed for 2026

Race days

Saturday 24 and Sunday 25 April 2027. 100,000 runners. First two-day edition, and the homepage says it is the only time.

Source
Awaiting 2026 detail

Clocks

Double FAQ: Saturday likely 09:00, finish close 17:30, which it calls 7 hours 45 minutes. Sunday likely 09:30. To be confirmed to participants.

Source
Awaiting 2026 detail

Course file

The course page has no GPX. It is not labeled 2027. Both days use the Greenwich to Westminster route, per the double FAQ.

Source
Read the full edition note

London Marathon · April 2027

Weather & climate

No climate table was on the homepage, the FAQ, or the course page.

In this guide · 1 decisions
  1. 01April can be cold at the start

April can be cold at the start

The 7–15°C band and 25% rain figure already in this record were not re-read today. Use the forecast for your assigned day.

Race-week weather

The seven-day window opens only when it matters

Checking the race-week forecast window…

Continue the plan

Apply the forecast to the start chainPlan layers, transport, start-village waiting, finish exit, and reunion.

Edition status

The homepage and the double FAQ, opened 4 November 2026, put the race on Saturday 24 and Sunday 25 April 2027, with 100,000 runners. Saturday is likely to start at 09:00 and the finish closes at 17:30. Sunday is likely to start at 09:30. The FAQ says those clocks will be confirmed later. The course page describes the route and does not say 2027. It has no GPX.