Half marathonRoad🇬🇧 Swansea, United Kingdom

Swansea Half Marathon

Sunday, 21 March 2027In 5 months · Start 09:00

A nearly flat 'city to the sea' half on closed roads, passing Swansea Castle and Brangwyn Hall before about five miles along the shore of Swansea Bay towards Mumbles.

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Facts checked 10 Oct 2026 against swanseahalfmarathon.co.uk, findarace.com.

Elevation gain

36 m

Flat · ↓ 36 m

Start altitude

16 m

above sea level, from terrain data

Temp at start

7°C

Peaks around 11°C

Entry fee

≈ $55

Open entry

Finishers

—

typical year

Course

Out and back

Cut-off: check site

Getting thereFly into CWL (Cardiff), about 48 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 36 m of climbing and 36 m of descent. A detailed profile isn’t available for this race yet.

Race-day weather

At start

7°C

Peak during race

11°C

Humidity

75%

Chance of rain

20%

Wind

17 km/h

Race day in past years

Historical averages for 21 March ±3 days, 2016–2025, from 09:00 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/swansea-half" title="Swansea Half Marathon on iRun42"><img src="https://irun42.com/badge/swansea-half.svg" width="300" height="120" alt="Swansea Half Marathon: course, elevation and race-day weather on iRun42" /></a>