Half marathonRoad🇬🇧 Cardiff, United Kingdom

Cardiff Half Marathon

Sunday, 3 October 2027In 12 months · Start 10:00

A flat, fast tour of the Welsh capital from the castle area through Cardiff Bay and across the barrage, with its only real climb late on at Roath Park.

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

Elevation gain

70 m

Flat · ↓ 70 m

Start altitude

14 m

above sea level, from terrain data

Temp at start

13°C

Peaks around 16°C

Entry fee

≈ $75

Lottery

Finishers

—

typical year

Course

Loop

Cut-off: check site

Getting thereFly into CWL (Cardiff), about 15 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 70 m of climbing and 70 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

13°C

Peak during race

16°C

Humidity

77%

Chance of rain

34%

Wind

19 km/h

Race day in past years

Historical averages for 3 October ±3 days, 2016–2025, from 10:00 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/cardiff-half" title="Cardiff Half Marathon on iRun42"><img src="https://irun42.com/badge/cardiff-half.svg" width="300" height="120" alt="Cardiff Half Marathon: course, elevation and race-day weather on iRun42" /></a>