H.C. Andersen Marathon: race-day weather at past editions
H.C. Andersen Marathon: at 9:00 on race day the temperature averaged 11 °C over 25 editions from 2000 to 2025 (from 4 °C to 17 °C); rain fell during race hours (08:00–14:00) in 4 editions (16%). Source: ERA5 reanalysis (Copernicus), data to 2025.
11 °Caverage at 9:00 on race day
4 / 25editions with rain 08–14 h
3 / 25editions with ≥ 20 °C by 14:00
22 °C (2009)warmest race morning–midday
Climate, not a forecast: these are statistics of past weather, not a forecast for the next edition.
Climate of the usual dates
Weather around the usual race date (28 September, ± 3 days) in 1991–2025:
- 12 °C — average temperature at 9:00
- 25% — share of mornings with rain 08–14 h
- 16 °C — average daily maximum
Average daily maximum on these dates: 14.8 °C in 1991–2005, 16.2 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2025 | 28 September | 12 °C | 18 °C | 0.0 mm |
| 2024 | 29 September | 8 °C | 14 °C | 0.0 mm |
| 2023 | 24 September | 11 °C | 18 °C | 0.1 mm |
| 2022 | 25 September | 11 °C | 15 °C | 0.6 mm |
| 2021 | 26 September | 13 °C | 19 °C | 0.0 mm |
| 2019 | 29 September | 13 °C | 15 °C | 0.3 mm |
| 2018 | 30 September | 12 °C | 15 °C | 0.0 mm |
| 2017 | 1 October | 13 °C | 16 °C | 1.4 mm |
| 2016 | 2 October | 12 °C | 14 °C | 5.7 mm |
| 2015 | 4 October | 10 °C | 14 °C | 0.0 mm |
| 2014 | 28 September | 13 °C | 18 °C | 0.2 mm |
| 2013 | 22 September | 14 °C | 19 °C | 0.1 mm |
| 2012 | 23 September | 8 °C | 14 °C | 0.0 mm |
| 2011 | 18 September | 13 °C | 15 °C | 6.6 mm |
| 2010 | 19 September | 10 °C | 14 °C | 0.1 mm |
| 2009 | 20 September | 12 °C | 22 °C | 0.0 mm |
| 2008 | 21 September | 12 °C | 16 °C | 0.1 mm |
| 2007 | 23 September | 13 °C | 19 °C | 0.0 mm |
| 2006 | 17 September | 17 °C | 21 °C | 0.0 mm |
| 2005 | 25 September | 14 °C | 21 °C | 0.0 mm |
| 2004 | 10 October | 4 °C | 12 °C | 0.0 mm |
| 2003 | 12 October | 7 °C | 13 °C | 0.0 mm |
| 2002 | 13 October | 6 °C | 7 °C | 0.2 mm |
| 2001 | 14 October | 12 °C | 16 °C | 0.0 mm |
| 2000 | 15 October | 9 °C | 15 °C | 0.0 mm |
How to read these numbers
- ERA5 gives daytime highs about 1–2.5 °C below nearby weather stations, so on warm race days runners felt more heat than the numbers here show; we do not correct for this.
- Edition window: the race day; 9:00 local time is taken as the typical start.
- Dates of past editions: Wikidata and Wikipedia (da, de, en); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 55.400, 10.383; ERA5 cell centred at 55.50, 10.50 (average ground height of the cell 13 m).