Rennes Marathon
Race Day Weather
Cool conditions, moderate wind
Runners will face a temperature range from 45°F at the start to 57°F by the finish, with humidity around 77%. A headwind throughout at 13 mph may affect pacing, and runners should consider adjusting their effort as temperatures rise. Hydration will be key, especially in the later stages.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Rennes Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Rennes Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Rennes Marathon is a 42.195-kilometer race through downtown Rennes in Brittany, France, starting at Mail François Mitterrand and finishing at Esplanade Charles de Gaulle. The two-loop, mostly flat course passes the Vilaine riverbanks, the Parliament of Brittany and Rennes City Hall, and carries FFA gold label certification. Race weekend also includes a Saturday-night 10K and a women's 5K, with a marathon finisher cutoff of 5 hours 30 minutes. First run in 2011, the race funds tree planting based on the distance each participant covers.
