riverthamesrunning.co.uk

River Thames Half Marathon

location_on

Walton-on-Thames, London, United Kingdom

calendar_today 25 Oct, 2026

About the Event

Achieve your personal best on a runner-friendly course at the River Thames Half Marathon on October 25, 2026. Starting at Walton Bridge, this largely traffic-free route follows the serene Thames towpath, offering a flat and fast multi-terrain experience that's perfect for PBs and first-timers alike. With enthusiastic marshals, dedicated pacers, and a fantastic finisher's mug, the event combines top-tier organization with a warm, community spirit for an unforgettable racing experience.

Races Offered

River Thames Half Marathon

Oct 25, 2026

straighten

Distance — 21.1K

terrain

Type — —

timer

08:30

Weather History

These values represent the 3-year monthly averages for October in Walton-on-Thames.

thermostat Temperature

9.5° / 15.8°

wb_sunny Feels like

6.8° / 13.2°

light_mode Avg sunshine hours

5h 53m

water_drop Avg rainfall

2.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

13.7 km/h (Gentle breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Low (2.8)

humidity_mid Humidity

83.6%

wb_twilight Sunrise

07:27

nightlight Sunset

18:07

About Walton-on-Thames

Learn more about the host city, Walton-on-Thames.

Walton-on-Thames, known locally as Walton, is a market town on the south bank of the Thames in northwest Surrey, England. It is in the Borough of Elmbridge, about 15 mi (24 km) southwest of central London. Walton forms part of the Greater London Built-up Area, and is served by a wide range of transport links. According to the 2011 Census, the town has a total population of 22,834. The town itself consists mostly of suburban streets, with a historic town centre of Celtic origin. It is one of the largest towns in Elmbridge, alongside Weybridge.