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Semi-Marathon de Boulogne-Billancourt
15 November 2026 · Boulogne-Billancourt, France
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A curated starting line-up, with dates checked against organisers. More guides are on the way. Suggest a race ↗
A forecast when it matters.
Perspective before it arrives.
In the last 14 days before race day, each guide shows the hourly forecast. Further out, mornings around race day in the last 5 years show what to expect. Every guide says which is which and links to its sources.
Marathon race-morning weather, 2021 to 2026The course is only half the story.
A flat course can still feel demanding in warm air or a headwind. Explore the route, understand the conditions, and use a goal pace as a starting point for your plan.
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