Helsinki City Marathon: race-day weather at past editions
Helsinki City Marathon: at 9:00 on race day the temperature averaged 16 °C over 26 editions with known dates from 1991 to 2021 (from 10 °C to 23 °C); rain fell during race hours (08:00–14:00) in 11 editions (42%). Source: ERA5 reanalysis (Copernicus), data to 2021.
16 °Caverage at 9:00 on race day
11 / 26editions with rain 08–14 h
11 / 26editions with ≥ 20 °C by 14:00
26 °C (2003)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 (16 August, ± 3 days) in 1991–2025:
- 16 °C — average temperature at 9:00
- 29% — share of mornings with rain 08–14 h
- 20 °C — average daily maximum
Average daily maximum on these dates: 19.9 °C in 1991–2005, 20.9 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2021 | 2 October | 10 °C | 12 °C | 0.0 mm |
| 2020 | 3 October | 11 °C | 15 °C | 0.0 mm |
| 2017 | 12 August | 19 °C | 23 °C | 0.0 mm |
| 2016 | 13 August | 14 °C | 15 °C | 4.8 mm |
| 2015 | 15 August | 16 °C | 20 °C | 0.0 mm |
| 2014 | 16 August | 17 °C | 19 °C | 3.4 mm |
| 2013 | 17 August | 16 °C | 18 °C | 0.9 mm |
| 2012 | 18 August | 16 °C | 22 °C | 0.2 mm |
| 2011 | 20 August | 17 °C | 20 °C | 0.0 mm |
| 2010 | 14 August | 23 °C | 24 °C | 8.1 mm |
| 2009 | 15 August | 14 °C | 20 °C | 0.0 mm |
| 2008 | 16 August | 15 °C | 16 °C | 2.0 mm |
| 2007 | 18 August | 15 °C | 18 °C | 1.9 mm |
| 2006 | 19 August | 18 °C | 24 °C | 0.0 mm |
| 2005 | 5 August | 15 °C | 20 °C | 0.8 mm |
| 2004 | 21 August | 17 °C | 19 °C | 1.5 mm |
| 2003 | 2 August | 22 °C | 26 °C | 0.0 mm |
| 2002 | 17 August | 17 °C | 21 °C | 0.0 mm |
| 2001 | 18 August | 17 °C | 22 °C | 0.0 mm |
| 2000 | 19 August | 16 °C | 20 °C | 0.0 mm |
| 1999 | 14 August | 13 °C | 18 °C | 0.0 mm |
| 1997 | 16 August | 12 °C | 18 °C | 0.0 mm |
| 1994 | 6 August | 20 °C | 24 °C | 0.0 mm |
| 1993 | 7 August | 17 °C | 19 °C | 4.6 mm |
| 1992 | 15 August | 14 °C | 16 °C | 5.8 mm |
| 1991 | 10 August | 15 °C | 19 °C | 0.7 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.
- No dates found for 1995, 1996, 1998, 2018, 2019: these editions are not counted.
- Dates of past editions: Wikidata and Wikipedia (de, en, fi); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 60.171, 24.938; ERA5 cell centred at 60.25, 25.00 (average ground height of the cell 33 m).