Greenwich to The Mall past Tower Bridge, with the biggest field of any marathon. Late April in London is usually cool and grey, with the occasional heatwave.
By Brett Heimlich, part-time runner.
Plan for about 54°F (12°C) at the 10:00 start, feeling like 49°F (9°C), with 65% humidity and 10 mph wind, warming to roughly 59°F (15°C) by the finish. It rained on 4 of the last 10 race days. Wear: Long Sleeve Tech Shirt, Capris or Light Tights, Running Cap, Waterproof Jacket.
54°F (12°C)
59°F (15°C)
4 of 10 years
44° to 67°F
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Conditions at the 10:00 start on the race's usual date each year (a Sunday in late April). Years when the race was cancelled or moved still show that date's weather. Source: Open-Meteo ERA5 archive.
| Year | Start temp | Feels like | Finish | Humidity | Wind | Rain | Sky |
|---|---|---|---|---|---|---|---|
| 2025 | 62°F (17°C) | 62°F | 69°F | 55% | 0 mph | – | Mostly clear |
| 2024 | 44°F (7°C) | 35°F | 48°F | 86% | 15 mph | 0.48 in | Drizzle |
| 2023 | 52°F (11°C) | 48°F | 52°F | 79% | 8 mph | 0.15 in | Drizzle |
| 2022 | 60°F (16°C) | 53°F | 64°F | 57% | 14 mph | – | Clear |
| 2021 | 50°F (10°C) | 40°F | 54°F | 58% | 15 mph | – | Overcast |
| 2020 | 58°F (14°C) | 57°F | 65°F | 58% | 1 mph | – | Mostly clear |
| 2019 | 53°F (12°C) | 45°F | 56°F | 60% | 13 mph | 0.07 in | Drizzle |
| 2018 | 67°F (19°C) | 65°F | 71°F | 68% | 10 mph | 0.17 in | Clear |
| 2017 | 51°F (11°C) | 46°F | 58°F | 70% | 8 mph | – | Drizzle |
| 2016 | 44°F (7°C) | 35°F | 49°F | 57% | 12 mph | – | Mostly clear |
Coldest start: 44°F (7°C) in 2024. Warmest: 67°F (19°C) in 2018. Wettest: 0.48 in in 2024.
Built from the 10-year average start conditions by the same engine as the live tool. Treat optional items as corral-only layers you can shed.
Long Sleeve Tech Shirt
Breathable moisture-wicking fabric
Waterproof Jacket
Breathable rain protection
Capris or Light Tights
3/4 length for moderate warmth
Running Cap
Keep rain out of eyes
Trail or Waterproof Shoes
Better grip and water resistance
✓ Worn by the author
Compression tight for 40 to 55°F, works under shorts
$78
✓ Worn by the author
Fast-drying micromesh tee for warm-weather miles
$75
Packable wind shell for cool morning miles
$115
✓ Worn by the author
Thin, ribbed quarter sock that keeps grit out
$36
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Over 2016 to 2025 the start averaged 54°F (12°C) (feels like 49°F (9°C)) with 65% humidity and 10 mph wind, warming to about 59°F (15°C) by the finish. It rained measurably on 4 of those 10 race days. The coldest start was 44°F (7°C) in 2024; the warmest was 67°F (19°C) in 2018.
For a typical 54°F (12°C) start: Long Sleeve Tech Shirt, Capris or Light Tights, Running Cap, Waterproof Jacket. Dress for about 15°F warmer than the start temperature, since the race itself adds that much, and plan to shed anything you only need in the corral.
The TCS London Marathon is usually held on a Sunday in late April. The next expected date is Sunday, April 25, 2027. Confirm on the official site, since dates occasionally move.
The live forecast on this page comes from Open-Meteo and unlocks 16 days before the race. Forecasts inside 7 days are reliable for temperature within a few degrees; rain timing firms up in the last 2 to 3 days. Until then, the 10-year history above is the best planning guide.
Get a what-to-wear call for the live forecast at your exact location, free, no signup.
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