Welwyn Half Marathon
Welwyn Garden City, United Kingdom · Monday 28 September 2026
The Welwyn Half Marathon takes place in the charming town of Welwyn Garden City, located in the Hertfordshire countryside. The course features a combination of urban and rural landscapes, beginning in the town center and passing through peaceful parks, wooded areas, and along country lanes. Runners will also enjoy stunning views of the nearby Hertfordshire Hills. The route is mostly flat, with some mild undulations, making it suitable for participants of all levels.
Difficulty Calculator
h
:m
:s
Adjusted Time
1:45:31
Time difference: +0.5 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain136m
Elevation High97m
Elevation Low66m
Weather Forecast
High16°C
Low10°C
Chance of Rain35%
How hard is Welwyn Half Marathon?
Moderateharder than 41% of half marathons
Flattest / easiestHardest
On our difficulty model, Welwyn Half Marathon plays about 2 minutes slower than an average road half marathon for a 1:30 runner. It ranks #267 hardest of 450 half marathons we analyse, and #57 of 89 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at Welwyn Half Marathon?
Estimated finish times on this course versus the same effort on an average road half marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On Welwyn Half Marathon | Difference |
|---|---|---|
| 1:30:00 | 1:30:00 | −00:00 |
| 1:45:00 | 1:45:31 | +00:31 |
| 2:00:00 | 2:01:05 | +01:05 |
| 2:15:00 | 2:16:42 | +01:42 |
| 2:30:00 | 2:32:20 | +02:20 |
| 2:45:00 | 2:48:01 | +03:01 |
| 3:00:00 | 3:03:44 | +03:44 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
Welwyn Half Marathon 2026 Course Analysis
Welwyn Half Marathon is a half marathon held in Welwyn Garden City, United Kingdom. It is scheduled for Monday 28 September 2026. The course is run on road surface with 136m of total climbing, with its high point near 97m above sea level. For registration and full race details, visit the official Welwyn Half Marathon website.
Elevation Profile
With 136m of total climbing, this is a gently undulating course. The elevation changes are manageable for most runners and shouldn't greatly affect your pacing.
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 racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
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.
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If Welwyn Half Marathon fits your goal, these courses play out about the same on our difficulty model.
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