2026 Thames Meander Marathon - Aug 9

2026 Thames Meander Marathon - Aug 9 Countdown

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Race Information

Race2026 Thames Meander Marathon - Aug 9
CityRichmond
Date2026-08-09 at 08:30
Time Limit6 hours 30 min
Cutoff pace9:15/km
TimezoneEurope/London
Official SiteHermes Running
RegistrationRegister · 55 GBP

Race Day Weather

Average Temperature14.5°C / 58°F
Humidity85%
Wind24.1 km/h
Rain Chance58%
Typical ConditionsWarm, settled summer morning in southwest London. Expect around 16-18C (61-64F) at the 08:30 start, climbing toward the low-to-mid 20s C (low 70s F) by late morning, with moderate humidity coming off the river and usually only a light breeze. August on the Thames is one of the milder, drier mornings in the UK racing calendar.

What to Prepare: Dress for a mild-to-warm summer morning and carry your own fluids between checkpoints - heat, not hills, is the limiter on this course. The towpath is firm and largely shaded by trees, so road shoes are ideal. Because it is flat, go out controlled: it is easy to bank too much early on the riverside straights and fade in the second lap.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 24.1 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

Cooler Typical Warmer
Temperature 12.4°C 14.2°C 17°C
Dew point 9.4°C 11.7°C 14.5°C
Wet-day chance: 58% Runnability: 68/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course TypeFlat out-and-back along the Thames Path towpath, run as two laps
Elevation Gain60m
TerrainTrail
ProfileGenuinely flat and fast, roughly 99% level along the river with only a few short ramps near bridges and slipways - well under 100m of total ascent. The marathon covers two out-and-back laps between Richmond and the Barnes turnaround, passing Kew Gardens. A true personal-best course on the watch, though note it is not an officially measured race.

Prepare for 2026 Thames Meander Marathon - Aug 9

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Featured In

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Frequently Asked Questions

What is the Thames Meander Marathon route?

The Thames Meander Summer marathon starts and finishes at the Petersham & Ham Sea Scouts HQ (Douglas House Meadow, Richmond, TW10 7AH) and runs a flat out-and-back along the Thames Path towpath, covered as two laps. The route follows the river past Kew Gardens to a turnaround near Barnes and back, almost entirely traffic-free. Checkpoints sit at the start/finish, Kew Gardens Car Park and Petersham. It is a small, friendly riverside event rather than a big-city marathon.

Is the Thames Meander Marathon flat? How fast is it?

Yes - it is genuinely flat and fast. The organisers describe the course as around 99% flat, run along the level Thames Path with only a few short ramps near bridges, so total climbing is well under 100m. It is one of the flattest marathons in the London area and a strong choice for a quick time. Plan even pacing with our pace calculator and sanity-check the gentle profile with our elevation profile tool.

What surface is the Thames Meander, and what shoes should I wear?

The course runs on the Thames Path towpath - a firm, mostly compacted and surfaced riverside path rather than muddy off-road trail. In dry summer conditions it is well suited to road shoes, which most runners wear here. After heavy rain a few sections can soften, so check the forecast; the surface is the main reason times can rival a road race despite the path setting.

What time does the Thames Meander Marathon start and what is the cut-off?

The marathon starts at 08:30 on Sunday 9 August 2026, after a short health-and-safety briefing - arrive at least 45 minutes early for parking, registration and bag drop. There is a 6.5-hour course time limit for the marathon. The same morning also hosts a half marathon and a 10K on the same riverside route.

How do I enter the Thames Meander Marathon 2026?

Entry is open to the public online through organiser Hermes Running (hermesrunning.com), with no ballot. The full marathon is around 55 GBP, the half marathon about 45 GBP and the 10K about 35 GBP. It is a capacity-limited, small-field event, so popular dates can sell out - book ahead. The Thames Meander also runs Spring (March) and Autumn (October) editions on the same course if August does not suit.

Can I use a Thames Meander time for Boston qualifying or London Good For Age?

No. Although the course is flat, fast and UK Athletics-permitted, it is run on the Thames Path towpath and is not an officially measured, road-certified course. The organisers state a Thames Meander time cannot be used as a London Marathon Good For Age (GFA) qualifying time, and the same applies to Boston qualifying (BQ). It is brilliant for a personal best on your watch, not for a qualifying standard. If a qualifying time is the goal, check the standards with our Good For Age tool and pick a certified road race.

How do I get to the Thames Meander start in Richmond?

The start at Petersham, just south of Richmond town, sits in southwest London with good public transport: Richmond station (London Underground District line and South Western Railway) is roughly a 30-40 minute walk or short bus ride away, with onward buses along Petersham Road. Parking near the riverside start is very limited, so most runners arrive by train and bus or share lifts. Allow extra time on race morning to reach the Sea Scouts HQ on foot from the station.

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