London Marathon: race-day weather at past editions
London Marathon: at 9:00 on race day the temperature averaged 9 °C over 35 editions from 1991 to 2025 (from 4 °C to 17 °C); rain fell during race hours (08:00–14:00) in 13 editions (37%). Source: ERA5 reanalysis (Copernicus), data to 2025.
9 °Caverage at 9:00 on race day
13 / 35editions with rain 08–14 h
3 / 35editions with ≥ 20 °C by 14:00
22 °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 (21 April, ± 3 days) in 1991–2025:
- 10 °C — average temperature at 9:00
- 24% — share of mornings with rain 08–14 h
- 14 °C — average daily maximum
Average daily maximum on these dates: 13.2 °C in 1991–2005, 15.3 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2025 | 27 April | 10 °C | 19 °C | 0.0 mm |
| 2024 | 21 April | 7 °C | 11 °C | 0.2 mm |
| 2023 | 23 April | 11 °C | 12 °C | 1.9 mm |
| 2022 | 2 October | 13 °C | 17 °C | 1.2 mm |
| 2021 | 3 October | 10 °C | 16 °C | 0.1 mm |
| 2020 | 4 October | 9 °C | 10 °C | 7.8 mm |
| 2019 | 28 April | 9 °C | 12 °C | 0.8 mm |
| 2018 | 22 April | 17 °C | 22 °C | 0.0 mm |
| 2017 | 23 April | 9 °C | 13 °C | 0.5 mm |
| 2016 | 24 April | 5 °C | 9 °C | 0.0 mm |
| 2015 | 26 April | 7 °C | 9 °C | 0.8 mm |
| 2014 | 13 April | 10 °C | 15 °C | 0.0 mm |
| 2013 | 21 April | 6 °C | 13 °C | 0.0 mm |
| 2012 | 22 April | 8 °C | 13 °C | 0.0 mm |
| 2011 | 17 April | 12 °C | 18 °C | 0.0 mm |
| 2010 | 25 April | 12 °C | 16 °C | 1.0 mm |
| 2009 | 26 April | 11 °C | 16 °C | 0.0 mm |
| 2008 | 13 April | 8 °C | 10 °C | 1.9 mm |
| 2007 | 22 April | 13 °C | 20 °C | 0.0 mm |
| 2006 | 23 April | 9 °C | 12 °C | 2.4 mm |
| 2005 | 17 April | 7 °C | 14 °C | 0.0 mm |
| 2004 | 18 April | 8 °C | 10 °C | 4.9 mm |
| 2003 | 13 April | 10 °C | 17 °C | 0.0 mm |
| 2002 | 14 April | 6 °C | 11 °C | 0.0 mm |
| 2001 | 22 April | 7 °C | 10 °C | 0.0 mm |
| 2000 | 16 April | 6 °C | 12 °C | 0.0 mm |
| 1999 | 18 April | 4 °C | 9 °C | 0.8 mm |
| 1998 | 26 April | 10 °C | 13 °C | 1.8 mm |
| 1997 | 13 April | 8 °C | 14 °C | 0.0 mm |
| 1996 | 21 April | 15 °C | 20 °C | 0.0 mm |
| 1995 | 2 April | 10 °C | 16 °C | 0.0 mm |
| 1994 | 17 April | 6 °C | 8 °C | 0.0 mm |
| 1993 | 18 April | 10 °C | 14 °C | 0.5 mm |
| 1992 | 12 April | 10 °C | 13 °C | 0.4 mm |
| 1991 | 21 April | 5 °C | 10 °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, es, fr, it, nl); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 51.473, 0.009; ERA5 cell centred at 51.50, 0.00 (average ground height of the cell 56 m).