Porto Half Marathon: race-day weather at past editions
Porto Half Marathon: at 9:00 on race day the temperature averaged 18 °C over 18 editions from 2007 to 2025 (from 13 °C to 21 °C); rain fell during race hours (08:00–14:00) in 4 editions (22%). Source: ERA5 reanalysis (Copernicus), data to 2025.
18 °Caverage at 9:00 on race day
4 / 18editions with rain 08–14 h
16 / 18editions with ≥ 20 °C by 14:00
29 °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 (18 September, ± 3 days) in 1991–2025:
- 18 °C — average temperature at 9:00
- 20% — share of mornings with rain 08–14 h
- 24 °C — average daily maximum
Average daily maximum on these dates: 23.2 °C in 1991–2005, 24.0 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2025 | 14 September | 19 °C | 24 °C | 0.0 mm |
| 2024 | 15 September | 18 °C | 28 °C | 0.0 mm |
| 2023 | 17 September | 18 °C | 19 °C | 2.8 mm |
| 2022 | 18 September | 21 °C | 29 °C | 0.0 mm |
| 2021 | 19 September | 15 °C | 22 °C | 0.0 mm |
| 2019 | 22 September | 17 °C | 20 °C | 0.3 mm |
| 2018 | 16 September | 18 °C | 23 °C | 0.0 mm |
| 2017 | 18 September | 16 °C | 20 °C | 0.8 mm |
| 2016 | 18 September | 18 °C | 25 °C | 0.0 mm |
| 2015 | 20 September | 18 °C | 27 °C | 0.0 mm |
| 2014 | 14 September | 20 °C | 23 °C | 0.5 mm |
| 2013 | 15 September | 20 °C | 26 °C | 0.0 mm |
| 2012 | 16 September | 19 °C | 25 °C | 0.0 mm |
| 2011 | 18 September | 17 °C | 21 °C | 0.0 mm |
| 2010 | 10 October | 15 °C | 19 °C | 0.2 mm |
| 2009 | 18 October | 13 °C | 20 °C | 0.0 mm |
| 2008 | 21 September | 19 °C | 24 °C | 2.0 mm |
| 2007 | 23 September | 17 °C | 24 °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 (en, nl, pt); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 41.150, -8.611; ERA5 cell centred at 41.25, -8.50 (average ground height of the cell 138 m).