Swiss City Marathon: race-day weather at past editions
Swiss City Marathon: at 9:00 on race day the temperature averaged 11 °C over 18 editions from 2007 to 2025 (from 0 °C to 16 °C); rain fell during race hours (08:00–14:00) in 5 editions (28%). Source: ERA5 reanalysis (Copernicus), data to 2025.
11 °Caverage at 9:00 on race day
5 / 18editions with rain 08–14 h
2 / 18editions with ≥ 20 °C by 14:00
21 °C (2022)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 October, ± 3 days) in 1991–2025:
- 10 °C — average temperature at 9:00
- 27% — share of mornings with rain 08–14 h
- 14 °C — average daily maximum
Average daily maximum on these dates: 14.1 °C in 1991–2005, 15.0 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2025 | 26 October | 8 °C | 9 °C | 5.4 mm |
| 2024 | 27 October | 15 °C | 18 °C | 0.0 mm |
| 2023 | 29 October | 12 °C | 18 °C | 0.0 mm |
| 2022 | 30 October | 14 °C | 21 °C | 0.0 mm |
| 2021 | 31 October | 13 °C | 17 °C | 0.0 mm |
| 2019 | 27 October | 15 °C | 20 °C | 0.0 mm |
| 2018 | 28 October | 5 °C | 5 °C | 6.2 mm |
| 2017 | 29 October | 11 °C | 12 °C | 4.3 mm |
| 2016 | 30 October | 10 °C | 14 °C | 0.0 mm |
| 2015 | 25 October | 13 °C | 17 °C | 0.0 mm |
| 2014 | 26 October | 12 °C | 16 °C | 0.0 mm |
| 2013 | 27 October | 16 °C | 19 °C | 0.6 mm |
| 2012 | 28 October | 0 °C | 1 °C | 3.5 mm |
| 2011 | 30 October | 13 °C | 16 °C | 0.0 mm |
| 2010 | 31 October | 12 °C | 14 °C | 0.2 mm |
| 2009 | 25 October | 14 °C | 16 °C | 0.0 mm |
| 2008 | 26 October | 11 °C | 16 °C | 0.0 mm |
| 2007 | 28 October | 9 °C | 13 °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 (de, en, fr); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 47.052, 8.306; ERA5 cell centred at 47.00, 8.25 (average ground height of the cell 899 m).