Cardiff Half Marathon

Cardiff Half Marathon 2027 Course Analysis

Cardiff Half Marathon is a half marathon held in Cardiff, United Kingdom, scheduled for Sunday 18 April 2027. The course is run on road surface with 68m of total elevation gain, reaching a maximum altitude of 31m above sea level. For registration and full race details, visit the official Cardiff Half Marathon website.

Elevation Profile

This is a very flat course with only 68m of total elevation gain across the full distance. The course ranges from 8m to 31m above sea level — a 23m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Expected Race Day Weather

Based on historical weather data for April, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 9°C to 14°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a high chance of rain (100%). Runners should prepare for wet conditions, including appropriate footwear and clothing choices.

Surface Type: Road

Cardiff Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.

How Difficult Is Cardiff Half Marathon?

Our difficulty rating for Cardiff Half Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based half marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

Looking for an easier marathon or a tougher challenge? You can also compare Cardiff Half Marathon against other half marathons to find the right race for your goals.