www.london100km.com

London 100

Name: London 100
Start: 2026-05-09
End: 2026-05-09
Location: City of Westminster

location_city City of Westminster

flag United Kingdom

calendar_today 09 May, 2026

directions_run Running

language Official Website

About the Event

Experience the ultimate city challenge at London 100 on Saturday, 9th May 2026, Central London's only urban 100km ultramarathon. This inclusive, accessible event offers three distances—100km, 50km, and 25km—allowing you to discover the capital’s hidden trails, famous landmarks, and lesser-known neighbourhoods from a superb indoor Run HQ. Designed for seasoned ultra-runners and marathoners stepping up alike, the route showcases over 100 top landmarks across four distinct 25km loops, supported by well-stocked checkpoints. With a generous 17-hour cut-off, the goal is to finish before midnight to earn a coveted finisher's medal and a chance to rank among London’s Top 100 running royalty. Secure your place for a unique, logistically simple ultra that turns one of the world’s greatest cities into your personal running adventure.

Races Offered

London 100

May 09, 2026

straighten

Distance — 100K

terrain

Type — Road running

timer

07:00

London 25

May 09, 2026

straighten

Distance — 25K

terrain

Type — Road running

timer

09:00

London 50

May 09, 2026

straighten

Distance — 50K

terrain

Type — Road running

timer

09:00

Weather Overview

These values represent the 3-year monthly averages for May in City of Westminster.

Temp (°C)

Feels Like (°C)

thermostat 9.1° / 18.1°

wb_sunny 6.7° / 15.1°

Wind (km/h)

Humidity (%)

air 13.0 /

water_drop 76.1%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 9.1° / 18.1°

wb_sunny 6.7° / 15.1°

air 13.0 km/h

water_drop 76.1%

About City of Westminster

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.