Marathon Vert de Rennes ·
What will race morning in Rennes cost you?
Past starts: 12°C typical, 7 to 16°C since 2021.
- ★★★★★5.080+ ratings
- 2,750+runners
- 100countries
On a computer? Scan with your phone camera to get the app.
Works with Apple Health01 · The conditions
Race-day weather
The past weather below is context for the next edition. We do not substitute today’s weather for a past race.
Explore historical weatherGet Rennes race-morning weather on your phone.
The app turns race-morning weather into your race plan: your goal pace, your race-day pace, and how to spend it from the start to the finish.
On a computer? Scan with your phone camera to get the app.
02 · Same effort, different day
What the weather may cost your goal
3:15:00 goal. On a typical race morning here, expect about 3:15 to 3:19. Main factor: heat.
- Heat and sun0%
- Wind and comfort+1%
- Weather total+1%
RunWeather’s pace model, one weather hour at your goal effort: weather at 09:00 local using the five-year race-morning average. A planning preview, not a predicted finish. Hills, turns, shelter, fuelling, heat adaptation and wave timing 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 | 0:23:06 |
| 10.0 km | 0:46:13 |
| 15.0 km | 1:09:19 |
| 20.0 km | 1:32:26 |
| 25.0 km | 1:55:32 |
| 30.0 km | 2:18:39 |
| 35.0 km | 2:41:45 |
| 40.0 km | 3:04:51 |
| 42.2 km · Finish | 3:15:00 |
In the app
Your race plan, on race morning
Add the Marathon Vert de Rennes 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.
Reference
Everything else about race morning
Open any row for the full detail.
Race day recap18 October 2026
Marathon Vert de Rennes ran on 18 October 2026. The weather recap for this edition is not published yet.
The course42.2 km · 25 to 46 m
The Marathon Vert de Rennes is a marathon in Rennes, France. The map is a past course. Check the organiser's map for this year.
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.
ELEVATION25–46 m0.0 km- Elevation
- 28 m
Hover or drag to explore. Use ← → when focused.
A past course from RunWeather's race catalogue. The next edition may differ; elevation is approximate. Elevation along that course, not confirmed for this year. Official race site ↗01The first start is listed at 09:00 local time. Check the forecast for your own wave or corral start.
02Compare the conditions at your start and expected finish before settling on kit and effort.
03Confirm late changes to the route, start wave and logistics with the organiser.
Race-window historyLast 5 years, race date ±5 days
A range for planning Marathon Vert de Rennes: weather near Rennes on race morning, the last 5 years (2021 to 2025, race date ±5 days). Not a forecast.
Typical start-hour air12°C10th–90th percentile 7°C–16°CDew point / humidity10°C93% relative humidityStart-hour wind13 km/hDirection varies by dayHours with rain24%Historical frequency at this hourAIR THROUGH THE RUN12°C → 16°C by +4hThe five-year picture
09:00- Air temperature
- 12°C
- Humidity
- 93%
- Wind
- 13 km/h
- Hours with rain
- 24%
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 5°C across four hours. Check your expected finish-hour forecast, not just the start.
WIND CONTEXTWhere the breeze came from
WIND FROMS11 of 55 samples · 20%
Mean 15 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. The sample uses the hour containing the advertised first start; waves may start later. Grid weather is modelled reanalysis, not an on-course station reading. Open-Meteo Historical Weather API . Data generated 2026-10-14.
Marathon Vert de Rennes FAQs7 questions
When is the 2026 Marathon Vert de Rennes?
Marathon Vert de Rennes is listed for 18 October 2026. Confirm the latest details on the official event website before travelling.
Is the weather shown a forecast for the Marathon Vert de Rennes?
Only from about 15 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 Marathon Vert de Rennes?
Around the 09:00 start, mornings around race day near Rennes in the last 5 years averaged 12°C, 93% humidity and 13 km/h wind. Most started between 7 and 16°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 Marathon Vert de Rennes?
2022. Around race day that year it was about 14°C around the 09:00 start, against 12°C on an average year.
Which recent year had the windiest race morning at the Marathon Vert de Rennes?
2023, with about 17 km/h of wind around the 09:00 start. Over the last 5 years the wind here came mostly from the south.
How should I pace the Marathon Vert de Rennes on a warm day?
3:15:00 goal. On a typical race morning here, expect about 3:15 to 3:19. Main factor: heat. On a warm day, start about 5 s/km 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 Marathon Vert de Rennes?
No. They show what race morning is usually like, not what this year will bring. Check the live forecast in the last 15 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 2026-10-13
Past race-morning weather: Open-Meteo Historical Weather API, weather near the city from 2021 to 2025, updated 2026-10-14. 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. The next edition may differ; elevation is approximate.
Rennes 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.