Typical race-morning air at Rotterdam Half averages 15°C across the last 10 years (about 10°C to 19°C in that window). The morning can still warm as you run. Use that range for planning, not as a promise for race day.
Half
Rotterdam Half
Upcoming, awaiting next editionRotterdam, South Holland, Netherlands
Goal time
1:35:00
Adjusted time (preview)
About 37 m of climbing and 44 m of descent. Mostly flat.
Almost all within 2%No grades over 6%No counted climbs
Impacts
Based on the forecast for race day.
Elevation
Heat
Wind
Total Impact
Race Pass: personalised finish time, adjusted splits, and your race-day pacing plan.
Race Day Forecast
The live outlook for this start.
Live forecast details appear when you are within the extended forecast window (typically up to about two weeks). Historical context remains below.
Race morning history
Last 10 years, around the 09:00 start hour. Typical mid-September air averages 15°C (about 10°C to 19°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
12-17°C
Almost all
11-19°C
Humidity
80%
Dew
11°C
WBGT
12°C
15°CAverage
09:00-10:35
Almost all (90%)Most mornings (70%)AverageRain
Blue is most mornings. Dashed lines are the rare tails. Pink is the average. The bands are historical race mornings, not a forecast range. Blue columns are rain on the right scale. This assumes a 1:35. You can set your own time in the app.
Typical race-morning wind
Where the wind usually came from on race morning, not where it was going.
SSW
Most frequent (30%)
Wind speed
0-6 km/h
6-13 km/h
13-21 km/h
21+ km/h
A start that feels cool is not a promise about the second half.
Related races
Same city, region or country, when we can resolve them. World majors also point to each other.
View race map for this area.
Pacing and conditions FAQ
Beyond conditions
Conditions are only part of the race-day loss
Pacing mistakes often add several minutes, sometimes more than conditions alone, especially when the course and conditions are not ideal.
What your plan includes
Everything you need to turn this race preview into a usable race-day plan.
Personalized pacing
Effort and pace guidance tuned to this course profile.
Weather-adjusted splits
Split targets that account for heat, wind, and elevation.
Heat adaptation & drafting
Adjust for your heat tolerance and drafting preferences.
Get your personalised race plan for Rotterdam Half.
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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