Half marathonRoad🇬🇧 London, United Kingdom

The Big Half

Sunday, 5 September 2027In 11 months · Start 09:00

London Marathon Events' community half: starts by Tower Bridge and runs through Tower Hamlets, Southwark and Lewisham to a finish near the Cutty Sark in Greenwich.

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Facts checked 10 Oct 2026 against londonmarathonevents.co.uk.

Elevation gain

50 m

Flat · ↓ 50 m

Start altitude

1 m

above sea level, from terrain data

Temp at start

17°C

Peaks around 21°C

Entry fee

≈ $80

Open entry

Finishers

—

typical year

Course

Point to point

Cut-off: check site

Getting thereFly into LHR (London), about 27 km from the start

Course map

A detailed route is not available for this race yet. The marker shows the race location.

Elevation profile

Flat: about 50 m of climbing and 50 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

17°C

Peak during race

21°C

Humidity

68%

Chance of rain

17%

Wind

14 km/h

Race day in past years

Historical averages for 5 September ±3 days, 2016–2025, from 09:00 for 5 hours (70 days sampled). Source: Open-Meteo / ERA5.

What time could you run here?Adjust your goal time for this course’s hills and typical race-day weather.Race time calculator →

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<a href="https://irun42.com/race/big-half" title="The Big Half on iRun42"><img src="https://irun42.com/badge/big-half.svg" width="300" height="120" alt="The Big Half: course, elevation and race-day weather on iRun42" /></a>