Cardiff Half Marathon 2027
- Date
- October 3, 2027
- Location
- Cardiff, United Kingdom
- Distance
- 21.1 km
- Difficulty
- Easy
- Field
- 27,500 finishers
The 2027 Cardiff Half Marathon takes place on Sunday, October 3, 2027 in Cardiff, United Kingdom. A flat, fast, fully closed-road loop course through Cardiff, Wales. Race-week weather is typically 10°C to 16°C.
Training for the Cardiff Half Marathon?
Coach Icarus builds your plan around your fitness and your schedule.
The course
A flat, fast, fully closed-road loop course through Cardiff, Wales. It starts outside Cardiff Castle on Castle Street, heads past the Principality Stadium and Cardiff City Stadium toward Penarth Marina, crosses the Cardiff Bay Barrage, and runs through Cardiff Bay past the Norwegian Church and Wales Millennium Centre. The route then heads north for a loop around Roath Park Lake before finishing in the Civic Centre outside the Temple of Peace.
Course summary source: barnardos.org.uk
Course map & elevation
No GPS track for this course yet.
We haven't mapped the Cardiff Half Marathon route yet. Elevation data will appear here once a licensed or organizer-verified course map is available.
Race-week weather
Typical high
16°C
Typical low
10°C
Year-to-year swing
±1.4°C
Rain
4.9 mm/day
Based on 2020-2025 of race-week history, with peak gusts around 22 km/h.
Difficulty
Race facts
- Official race site
- cardiffhalfmarathon.co.uk ↗
- Start time
- 10:00
- Field size
- 27,500 finishers (2025)
- Boston qualifier
- No
Distances: 21.1 km
When is the Cardiff Half Marathon 2027?
The 2027 Cardiff Half Marathon takes place on Sunday, October 3, 2027.
Training for the Cardiff Half Marathon?
Coach Icarus builds your plan around your fitness and your schedule.
Predict your finish time
Enter one recent race result and get predicted finish times across 5K, 10K, half marathon, and marathon.
Predicted Finish Time
52:07
Pace / km
5:13
Pace / mile
8:23
| Distance | Predicted Time |
|---|---|
| 5K | 25:00 |
| 10K | 52:07 |
| Half Marathon | 1:55:00 |
| Marathon | 3:59:47 |
Predictions assume similar fitness, course, and conditions — they are a starting point for goal setting, not a guarantee.
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