Roma-Ostia Half Marathon: race-day weather at past editions
Roma-Ostia Half Marathon: at 9:00 on race day the temperature averaged 10 °C over 32 editions with known dates from 1991 to 2025 (from 2 °C to 15 °C); rain fell during race hours (08:00–14:00) in 8 editions (25%). Source: ERA5 reanalysis (Copernicus), data to 2025.
10 °Caverage at 9:00 on race day
8 / 32editions with rain 08–14 h
1 / 32editions with ≥ 20 °C by 14:00
20 °C (2018)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 (2 March, ± 3 days) in 1991–2025:
- 9 °C — average temperature at 9:00
- 26% — share of mornings with rain 08–14 h
- 15 °C — average daily maximum
Average daily maximum on these dates: 14.5 °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 | 2 March | 12 °C | 18 °C | 0.0 mm |
| 2024 | 3 March | 13 °C | 17 °C | 0.0 mm |
| 2023 | 5 March | 8 °C | 16 °C | 0.0 mm |
| 2022 | 6 March | 6 °C | 12 °C | 0.0 mm |
| 2019 | 10 March | 13 °C | 16 °C | 0.4 mm |
| 2018 | 11 March | 15 °C | 20 °C | 1.8 mm |
| 2017 | 12 March | 9 °C | 16 °C | 0.0 mm |
| 2016 | 13 March | 12 °C | 16 °C | 0.0 mm |
| 2015 | 1 March | 9 °C | 15 °C | 0.0 mm |
| 2014 | 2 March | 7 °C | 11 °C | 0.2 mm |
| 2013 | 3 March | 7 °C | 15 °C | 0.0 mm |
| 2012 | 26 February | 8 °C | 14 °C | 0.0 mm |
| 2011 | 27 February | 5 °C | 10 °C | 0.2 mm |
| 2010 | 28 February | 14 °C | 18 °C | 0.0 mm |
| 2009 | 1 March | 10 °C | 13 °C | 1.4 mm |
| 2008 | 24 February | 7 °C | 18 °C | 0.0 mm |
| 2007 | 25 February | 11 °C | 15 °C | 0.0 mm |
| 2006 | 5 March | 14 °C | 14 °C | 6.2 mm |
| 2005 | 27 February | 2 °C | 7 °C | 0.5 mm |
| 2004 | 29 February | 4 °C | 10 °C | 0.9 mm |
| 2003 | 23 February | 3 °C | 12 °C | 0.0 mm |
| 2002 | 24 February | 8 °C | 15 °C | 0.1 mm |
| 2001 | 25 February | 11 °C | 13 °C | 1.0 mm |
| 2000 | 19 March | 11 °C | 14 °C | 0.5 mm |
| 1998 | 1 March | 14 °C | 17 °C | 0.1 mm |
| 1997 | 23 February | 7 °C | 13 °C | 0.0 mm |
| 1996 | 25 February | 4 °C | 11 °C | 0.0 mm |
| 1995 | 26 February | 14 °C | 17 °C | 1.0 mm |
| 1994 | 20 March | 13 °C | 16 °C | 0.0 mm |
| 1993 | 21 March | 14 °C | 18 °C | 0.0 mm |
| 1992 | 15 March | 11 °C | 17 °C | 0.0 mm |
| 1991 | 17 March | 10 °C | 17 °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.
- No dates found for 1999: these editions are not counted.
- Dates of past editions: Wikidata and Wikipedia (de, en, fr, it); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 41.893, 12.483; ERA5 cell centred at 42.00, 12.50 (average ground height of the cell 137 m).