London Marathon weather
What will race morning in London cost you?
London Marathon mornings around race day since 2021, by weather-model estimate: about 9°C (49°F) at 09:00 near London. Most were 7 to 12°C.
- Date
- 24 to 25 April 2027
- First start
- Not confirmed
- Distance
- 42.2 km
| Year | Air | Dew pt | Wind | Rain hrs |
|---|---|---|---|---|
| 2025 | 11°C | 8°C | 11 km/h | 9% |
| 2024 | 8°C | 4°C | 16 km/h | 27% |
| 2023 | 9°C | 6°C | 14 km/h | 18% |
| 2022 | 10°C | 6°C | 17 km/h | 0% |
| 2021 | 8°C | 4°C | 13 km/h | 0% |
By weather-model estimate near the race, mornings around race day. Not station readings.
The 2027 event takes place on 24 and 25 April, with both days following the route from Greenwich to Westminster. Check your allocated race day before planning travel or weather. Organiser route
Past starts: 9°C typical, 7 to 12°C since 2021.Live forecast opens 10 April.
01 · The conditions
Race-day weather
Race-day forecasts appear 14 days before the race. Until then, here is what race morning has looked like.
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Example race: a hot half marathon in Florida
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Works with Apple HealthGet London race-morning weather on your phone when it opens.
Set up London in the app now: your goal, your start, your pace plan. The race-morning forecast lands in it in race week.
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Example race: a hot half marathon in Florida
02 · Same effort, different day
What the weather may cost your goal
4:00:00 goal. On a typical race morning here, expect about 4:00 to 4:03. Main factor: wind.
- Heat and sun0%
- Wind and comfort0%
- Weather total0%
RunWeather’s pace model at your goal effort, over every hour you are on course (09:00 to 13:00 local), weighted by the time you spend in each, using the five-year race-morning average. A planning preview, not a predicted finish. Hills, turns, shelter, fuelling and heat adaptation are not modelled here; rain is left out because a probability is not a measured rain rate. Explore the heat pace calculator.
View even-pace checkpoints
| Distance | Elapsed time |
|---|---|
| 5.0 km | 0:28:26 |
| 10.0 km | 0:56:53 |
| 15.0 km | 1:25:19 |
| 20.0 km | 1:53:45 |
| 25.0 km | 2:22:12 |
| 30.0 km | 2:50:38 |
| 35.0 km | 3:19:05 |
| 40.0 km | 3:47:31 |
| 42.2 km · Finish | 4:00:00 |
In the app
Your race plan, on race morning
Add the London Marathon and the app keeps your plan current until the gun.
Goal pace against race-day pace
What your goal is worth on this morning’s weather, per km and at the finish.
How to spend it
Start, middle and finish, against your average.
What slows you
Heat, wind and hills, each in minutes.
Goal vs race day
What slows you
Example race: a hot half marathon in Florida
Reference
Everything else about race morning
Open any row for the full detail.
The course42.2 km · 2 to 53 m
The 2027 event takes place on 24 and 25 April, with both days following the route from Greenwich to Westminster. Check your allocated race day before planning travel or weather.
THE COURSE42.2 km1×Zoom to drag the route. Keyboard: + / −, arrows, Home to reset.
Course year unverified. Check the organiser’s map for this year.
ELEVATION2–53 m0.0 km- Elevation
- 40 m
Hover or drag to explore. Use ← → when focused.
A past course from RunWeather's race catalogue; year not confirmed. The next edition may differ; elevation is approximate. Elevation along that course, not confirmed for this year. Official race site ↗01Use your allocated Saturday or Sunday race date; the two days can have different weather.
02Choose your kit from the forecast during your own start and finish window.
03Use the official course map for this year's route. The map here does not say which year it shows.
Race-window historyLast 5 years, race date ±5 days
A range for planning London Marathon: weather near London on race morning, the last 5 years (2021 to 2025, race date ±5 days). Not a forecast.
Typical start-hour air9°C10th–90th percentile 7°C–12°CDew point / humidity6°C79% relative humidityStart-hour wind14 km/hDirection varies by dayHours with rain11%Historical frequency at this hourAIR THROUGH THE RUN9°C → 13°C by +4hThe five-year picture
09:00- Air temperature
- 9°C
- Humidity
- 79%
- Wind
- 14 km/h
- Hours with rain
- 11%
Hover or drag to explore. Use ← → when focused. Shading: middle 80% of sampled temperatures.
Five-year average Middle 80% of sampled hoursThe sampled air warms by about 4°C across four hours. Check your expected finish-hour forecast, not just the start.
WIND CONTEXTWhere the breeze came from
WIND FROMNE20 of 55 samples · 36%
Mean 16 km/hThe petals show how often the wind came from each direction at the sampled start hour. They do not predict the direction on race day.
A city-point wind rose cannot tell you which parts of the course will be sheltered or exposed. Use the live forecast and the organiser’s route map together.
Method: 55 ERA5 hourly samples at 09:00 local time, across 11 calendar days per year in 2021–2025. A 09:00 sample is used because the organiser has not confirmed a first start in this guide. Grid weather is modelled reanalysis, not an on-course station reading. Open-Meteo Historical Weather API . Data generated 2026-09-29.
April climateAll-hours monthly averages
April averages in London, from 2022 to 2024. These are monthly conditions, not a race-day forecast.
- mean temperature
- 10°C
- mean humidity
- 74%
- mean wind
- 16 km/h
- hours with rain
- 18%
Monthly, all-hours averages for London, 2022–2024. Not past race-day measurements or a forecast. Rain is the share of historical hours with precipitation, not the chance of rain on race day. Source: Open-Meteo ERA5.
Explore running weather in LondonLondon Marathon FAQs7 questions
When is the 2027 London Marathon?
The 2027 London Marathon takes place on Saturday 24 and Sunday 25 April. Check the race day allocated by the organiser; the weather may differ between days.
Is the weather shown a forecast for the London Marathon?
Only from about 14 days before the race, when the page shows the live race-day forecast. Before that, you see the weather near the city on the mornings around race day in the last 5 years: what is typical, not what will happen. Monthly averages, when shown, cover every hour of the race month.
What is race morning usually like at the London Marathon?
At 09:00 (the start time is not confirmed), mornings around race day near London in the last 5 years averaged 9°C (49°F), 79% humidity and 14 km/h wind. Most started between 7°C and 12°C. This is weather near the city, not a reading from the race itself or a forecast.
Which recent year had the warmest race morning at the London Marathon?
2025. Around race day that year it was about 11°C (52°F) at 09:00 (the start time is not confirmed), against 9°C (49°F) on an average year.
Which recent year had the windiest race morning at the London Marathon?
2022, with about 17 km/h of wind at 09:00 (the start time is not confirmed). Over the last 5 years the wind here came mostly from the north-east.
How should I pace the London Marathon on a warm day?
4:00:00 goal. On a typical race morning here, expect about 4:00 to 4:03. Main factor: wind. If race day comes in warmer, start a little easier than goal pace, run by feel to halfway and drink early. Plan my race gives your splits for the day.
Can past years predict the weather on race day at the London Marathon?
No. They show what race morning is usually like, not what this year will bring. Check the live forecast in the last 14 days, look at the hours through your expected finish, and follow the organiser for start and course updates.
Sources and race informationOrganiser, weather data, guide reviewed 2026-09-22
Past race-morning weather: Open-Meteo Historical Weather API, weather near the city from 2021 to 2025, updated 2026-09-29. Not official race-day readings.
Guide reviewed . RunWeather is an independent guide, not the race organiser. Dates, waves and routes can change; the organiser’s latest instructions take priority. Course map: A past course from RunWeather's race catalogue; year not confirmed. The next edition may differ; elevation is approximate.
London race morning, on your phone.
Free on iPhone and Android. Your race plan, updated with the forecast until the gun.
On a computer? Scan with your phone camera to get the app.
Example race: a hot half marathon in Florida