Welwyn Half Marathon

Welwyn Half Marathon 2025 Course Analysis

Welwyn Half Marathon is a half marathon held in Welwyn Garden City, United Kingdom, scheduled for Sunday 28 September 2025. The course is run on road surface with 136m of total elevation gain, reaching a maximum altitude of 97m above sea level. For registration and full race details, visit the official Welwyn Half Marathon website.

Elevation Profile

With 136m of elevation gain, this is a moderately undulating course. The route ranges from 66m to 97m above sea level (31m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.

Expected Race Day Weather

Based on historical weather data for September, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 10°C to 16°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a moderate chance of rain (35%). Runners may want to prepare for wet conditions but shouldn't expect persistent rainfall.

Surface Type: Road

Welwyn 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 Welwyn Half Marathon?

Our difficulty rating for Welwyn 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 Welwyn Half Marathon against other half marathons to find the right race for your goals.