worldsmarathons.com

London 100

Name: London 100
Start: 2027-06-12
End: 2027-06-12
Location: London

London, East of England, United Kingdom

calendar_today 12 Jun, 2027

directions_run Running

language Official Website

sell £59.14 – £128.56

About the Event

Immerse yourself in the heart of Central London at the London 100, an ultramarathon that showcases the city’s diverse landscapes and hidden gems. This iconic race offers three challenge distances: 100km, 50km, and a more accessible 25km option for runners looking to step up from marathons or half-marathons.
Starting at a state-of-the-art indoor Run HQ in Central London, participants embark on four distinct 25km routes that venture north, south, east, and west of the city. Each route reveals unique terrains and scenic vistas, allowing you to explore areas of London that are often overlooked by tourists. Discover hidden trails, secret parks, and lesser-known neighborhoods while also passing iconic landmarks such as Big Ben, Buckingham Palace, and Tower Bridge.
The event is designed for experienced ultramarathoners who thrive on long-distance challenges, as well as runners looking to push their limits in a supportive environment. Whether you’re chasing personal records or simply enjoying the camaraderie of fellow athletes, London 100 offers an unforgettable journey through one of the world’s most vibrant cities.
Experience the thrill and beauty of running across different parts of London, from bustling streets to serene green spaces, making this ultramarathon a must for any serious runner.

Races Offered

London 25

May 09, 2026

straighten

Distance — 25K

terrain

Type — Running

timer

09:00

London 100

Jun 12, 2027

straighten

Distance — 100K

terrain

Type — Running

timer

07:00

sell

£128.56

London 50

Jun 12, 2027

straighten

Distance — 50K

terrain

Type — Running

timer

09:00

sell

£89.13

London 25km (East)

Jun 12, 2027

straighten

Distance — 25K

terrain

Type — Running

timer

254 days remaining

sell

£59.14

Weather History

These values represent the 3-year monthly averages for June in London.

thermostat Temperature

9.4° / 18.5°

wb_sunny Feels like

6.9° / 15.5°

light_mode Avg sunshine hours

10h 29m

water_drop Avg rainfall

1.5 mm

ac_unit Avg snowfall

—

air Avg wind speed

12.5 km/h (Gentle breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.2)

humidity_mid Humidity

72.0%

wb_twilight Sunrise

05:07

nightlight Sunset

20:46

About London

Learn more about the host city, London.

The City of Westminster is a London borough with city status in Greater London, England. It is the site of the United Kingdom's Houses of Parliament and much of the British government. It contains a large part of central London, including most of the West End, such as the major shopping areas around Oxford Street, Regent Street, Piccadilly and Bond Street, and the entertainment district of Soho. Many London landmarks are within the borough, including Buckingham Palace, Westminster Abbey, Whitehall, Westminster Cathedral, 10 Downing Street, and Trafalgar Square.