Windsplit · race guide · Amsterdam, Netherlands
Mizuno Half Marathon Amsterdam starts Sunday 18 October 2026 at 13:20 local time from Olympisch Stadion. Below: the live forecast for race day, which parts of the course take the wind, the elevation profile and how to turn it into a pacing plan.
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Run on marathon day: out past the Vondelpark and the Rijksmuseum, then the Amstel stretch home from km 4 and the last 9 km shared with the marathon course into the Olympic Stadium. Course from a drawn route scaled to the official distance; check the start time with the organiser.
Numbers are km markers. North is up.
53 m up, 56 m down, -2–9 m above sea level. 10 m between grid lines.
Computed from the direction the course runs in each kilometre. A kilometre counts as headwind when the wind comes from within 60° of straight ahead, and as tailwind when it comes from within 60° of straight behind. Find the forecast wind direction and read your row.
| Wind from | Headwind km | Tailwind km | Headwind share |
|---|---|---|---|
| N (north) | 9–13 | 4, 6, 20–21 | 23 % |
| NE (north-east) | 1–3, 7–8, 11–12 | 14–16, 18–21 | 34 % |
| E (east) | 1–3, 6–8 | 10, 14–19 | 29 % |
| SE (south-east) | 1–4, 6 | 9–10, 13–14, 17 | 24 % |
| S (south) | 4, 6, 20–21 | 9–13 | 19 % |
| SW (south-west) | 14–16, 18–21 | 1–3, 7–8, 11–12 | 33 % |
| W (west) | 10, 14–19 | 1–3, 6–8 | 33 % |
| NW (north-west) | 9–10, 13–14, 17 | 1–4, 6 | 23 % |
53 m of climbing and 56 m of descent over 21.1 km, between -2 and 9 m above sea level. Run on marathon day: out past the Vondelpark and the Rijksmuseum, then the Amstel stretch home from km 4 and the last 9 km shared with the marathon course into the Olympic Stadium. Course from a drawn route scaled to the official distance; check the start time with the organiser.
It depends on the wind direction on the day. With a wind from the north-east, the course has a headwind on km 1–3, 7–8, 11–12 (34 % of the distance) and a tailwind on km 14–16, 18–21. The table on this page lists all eight directions; the race plan uses the actual forecast hour by hour.
Windsplit shows a forecast from 16 days out, but wind forecasts usually converge in the last three days. Check the evening before and again on race morning: the tool refreshes every 30 minutes, and the confidence line shows whether the models agree.
Yes. Replay reads the activity from Strava or a GPX/FIT file, fetches the weather that was recorded along the route, and shows the wind, hill and heat cost per kilometre, plus an adjusted pace in still air. If you planned the race in Windsplit on the same device, it compares the prediction with the result.