Rennes Marathon

Rennes, France · October 18, 2026
partly-cloudy-day47°·59° high·Breezy·Dry
8
Register

Race Day Weather

partly-cloudy-day
47°at start
59° high
Breezy
Dry

Cool start, steady conditions ahead

Runners will face temperatures starting at 47°F and rising to 59°F. Winds will be moderate from the NE at 14 mph, with gusts up to 23 mph. With humidity at 70%, pacing should be conservative at the start to ensure comfort throughout the race. No rain is expected, but a light layer may be useful during the pre-race warm-up.

partly-cloudy-night8
partly-cloudy-night8
partly-cloudy-day8
partly-cloudy-day8
partly-cloudy-day8
partly-cloudy-day8
partly-cloudy-day7
partly-cloudy-day8
partly-cloudy-day8
partly-cloudy-day7

Pace Calculator

Distance: 26.2mi
0:00:00
HH:MM:SS
Pace
—
Weather Adj.
—
Common Goals:

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.

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.

Area Map

Course Map

FAQ

When is the 2026 Rennes Marathon?

The 2026 Rennes Marathon will be held on Sunday October 18, 2026.

Is the Rennes Marathon a Boston Marathon Qualifier?

Yes, the Rennes Marathon is an official Boston Marathon qualifier.

What is the time limit for the Rennes Marathon?

The time limit for the Rennes Marathon is 5.5 hours.

What will the weather be like for the 2026 Rennes Marathon?

The forecast calls for a high of 59°F and a low of 44°F with a 23% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 4 years of data
Avg Temp
62°F
L:50° H:62°
RunScore
8
Conditions
Rain Freq
25%
1 of 4 yrs
Wind10mph
Dew51°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
cloudy
46°/54°Light
8
2024
partly-cloudy-day
47°/61°-
9
2023
clear-day
48°/63°-
9
2022
partly-cloudy-day
59°/70°-
7